Jeep

Have Jeep Questions? Ask a Jeep Repair Expert for Answers

Ask an Expert,
Get an Answer ASAP!

Jeep
This answer was rated:

wiring diagrams for under hood and dash 1998 jeep wrangler

wiring diagrams for under hood and dash 1998 jeep wrangler
Ask Your Own Jeep Question
Answered in 6 minutes by:
10/14/2010
Scott
Scott, Technician
Category: Jeep
Satisfied Customers: 1,190
Experience: Dodge,Chrysler,Jeep Master Tech since 92.ASE Master since 1990.Currently Dealer employed.
Verified

Scott :

Hello, The wiring diagrams are not "continous" They are formated by specific circuits or componets - like this .[IMAGE][SRC][/SRC][ALT]tj808606[/ALT][WIDTH]100[/WIDTH][HEIGHT]100[/HEIGHT][STYLE][/STYLE][/IMAGE] There are at least 15 pages like this just for the cluster. What circuits do you need - or what are you trying to do?

Scott :

Lets try again.

Full Size Image

Ask Your Own Jeep Question
We can send all the pages need - Scott.
Ask Your Own Jeep Question
Customer reply replied 7 years ago
i am trying to track down a short car won't start no fire to plugs no gauges have no bus on mileage reading i have changed the cps but did't fix it

Ok- Thanks. I assume you have checked all the fuses ? We often see this problem when the engine computer fails or battery acid has damaged the wiring of the computer.

We test for a failing computer by moving the three connectors slightly to see if the engine will restart. We also look for acid damage to the wiring.Let me know if you want more info- I can send the diagnostics from the manual- It basically has you test the wires that communicate to the rest of the modules, test for power and ground at the computer connector- then replace the computer- Of course there are many other steps- but you need to have a scan tool that can read the engine and other modules- like the cluster and air bag , brakes, ect..Let me know what you find when you move the engine computer connectors. Thanks Scott.

Ask Your Own Jeep Question
Customer reply replied 7 years ago
i have uplug all the sensos one at a time to check them i have found that unhookig the neg. battery post and with atest meter between the cable and the post i get 12 volts with everything off when i unplug the 50 amp fuse it goes away i have also checked the comp. plugs they seam ok thats why i need to check the wiring i think there is a short somewhere

Ok, I will send the info that I think will help the most.

Using a voltmeter as described will always show 12 volts unless the fuse is pulled that supplies memory power to the radio, air bag,computer, cluster. The 50 amp fuse must also supply the power for the memories.

The problem with the engine computer not communicating with the cluster can be caused by many different problem . The most often computer failure is caused by loose power connection inside the computer on the circuit board. Moving the connectors will sometimes cause the loose connection inside to reconnect - this would make the relays to click and the cluster to start working again.And the engine to start. The relays would only click if the key was on. Some computer failures will not respond to tapping the computer or moving the connectors. A Shorted sensor can cause the engine to not start.

On the rear of the engine on the drivers side valve cover there is a stud that can rub into the wiring harness, Inspect that area.

We test for shorted sensors by eliminating them one at a time. We start at the crank sensor, cam sensor, tps, map sensor ,o2 sensors ect.. We disconnect one sensor- cycle the key on check to see if the no buss returns- or we will connect the volt meter to the tps sensor and watch to see if the 5 volt supply returns after a sensor is disconnected. You will have to disconnect all the sensors one at a time.

I will gather more info, I will be back. Thanks Scott.

 

 

Scott
Scott, Technician
Category: Jeep
Satisfied Customers: 1,190
Experience: Dodge,Chrysler,Jeep Master Tech since 92.ASE Master since 1990.Currently Dealer employed.
Verified
Scott and 87 other Jeep Specialists are ready to help you
Ask your own question now
Customer reply replied 7 years ago
i have unhooked all the sensors one at time as you said and i still have no guages and the no bus on the mileage and no fire to the plugs could it be a bad comp. and all the fuses are good what happened was my son was on his way home and hit a bump and all the iside lights went off and all the guages but it was still running till he sut it off the net time he went to start it up it would not start i have plug a tester in to the under dash plug and we did not get any readings from the comp.

This is 1/5 of the info - more to follow. I read your post before I posted- I think you have a bad computer. Try tapping on it while some one cranks it over. Let me know if you need the other 4/5 of the dianostic for this

 

Symptom:

* ENGINE DOES NOT START & DRB DISPLAYS NO RESPONSE

POSSIBLE CAUSES

NO RESPONSE DISPLAYED

ASD RELAY OUTPUT CIRCUIT SHORTED TO GROUND

DRB ADAPTER CABLE

FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

IGNITION COIL

PCM 5-VOLT PRIMARY SUPPLY CIRCUIT SHORTED TO GROUND

PCM 5-VOLT SECONDARY SUPPLY CIRCUIT SHORTED TO GROUND

TPS GROUND CIRCUIT SHORTED TO VOLTAGE

CAMSHAFT POSITION SENSOR

CRANKSHAFT POSITION SENSOR

FUEL INJECTOR(S)

GENERATOR SHORTED TO GROUND

OIL PRESSURE SENDING UNIT

SCI RECEIVE CIRCUIT OPEN

SCI RECEIVE CIRCUIT SHORTED TO GROUND

SCI TRANSMIT CIRCUIT OPEN

SCI TRANSMIT CIRCUIT SHORTED TO GROUND

DRB

MANIFOLD ABSOLUTE PRESSURE SENSOR

O2 SENSOR(S)

PCM DEFECTIVE (NO RESPONSE)

PCM GROUND CIRCUIT(S) OPEN

POWERTRAIN CONTROL MODULE (NS-6D)

VEHICLE SPEED SENSOR

FUSED B(+) CIRCUIT OPEN BETWEEN FUSE/BATTERY

FUSED B(+) CIRCUIT SHORTED TO GROUND

FUSED B(+) CIRCUIT OPEN BETWEEN FUSE/PCM

LEAK DETECTION PUMP

STARTING

TEST ACTION APPLICABILITY

1 Key off.

Disconnect the Powertrain Control Module Black Connector.

Note: Check connectors - Clean/repair as necessary.

Using an Ohmmeter, measure both Ground Circuits at PCM Connector.

Is the resistance below 5.0 ohms at both Terminals?

All

Yes - Go To 2

No -Repair the open ground(s) at the Powertrain Control Module.

2 -Key off.

Disconnect the Powertrain Control Module Black Connector.

Note: Check connectors - Clean/repair as necessary.

Turn ignition on.

Using a Voltmeter, measure the Fused Ignition Switch Output Circuit.

Is the voltage above 10.0 volts?

All

Yes -Go To 3

No - Repair the open Fused Ignition Switch Output Circuit between

PCM & Ignition Switch.

3 -Key off.

Disconnect the Powertrain Control Module Black Connector.

Note: Check connectors - Clean/repair as necessary.

With a Voltmeter, measure the Fused B(+) Circuit in the PCM Connector.

Is the voltage above 10.0 volts?

All

Yes - Go To 4

No - Go To 13

4- Ignition Off

Disconnect the Throttle Position Sensor.

Note: Check connectors - Clean/repair as necessary.

Ignition key on.

Connect a Voltmeter to the Throttle Position Sensor 5-Volt Supply Circuit.

Is the voltage below 4.0 volts?

All

Yes - Go To 5

No -Replace the Powertrain Control Module.

.

5 -Ignition Off

Disconnect the Camshaft Sensor.

Note: Check connectors - Clean/repair as necessary.

Ignition key on.

Connect a Voltmeter to the Camshaft Position Sensor 5-Volt Supply Circuit.

Read Voltmeter.

Is the voltage below 4.0 volts?

All

Yes -Go To 6

No - Replace the Camshaft Sensor.

279

STARTING

* ENGINE DOES NOT START & DRB DISPLAYS NO RESPONSE -

Continued

TEST ACTION APPLICABILITY

6 -Ignition Off

Disconnect the Crankshaft Sensor.

Note: Check connectors - Clean/repair as necessary.

Ignition key on.

Connect a Voltmeter to the Crankshaft Position Sensor 5-volt Supply Circuit.

Read Voltmeter.

Is the voltage below 4.0 volts?

All

Yes Go To 7

No - Replace the Crankshaft Sensor.

Perform Powertrain Verification Test VER-1.

7 -Ignition Off

Disconnect the MAP Sensor.

Note: Check connectors - Clean/repair as necessary.

Ignition key on.

Connect a Voltmeter to the Manifold Absolute Pressure Sensor 5-Volt Supply Circuit.

Read Voltmeter.

Is the voltage below 4.0 volts?

All

Yes - Go To 8

No - Replace the MAP Sensor.

8 - Ignition Off

Disconnect the Vehicle Speed Sensor.

Note: Check connectors - Clean/repair as necessary.

Ignition key on.

Connect a Voltmeter to the Vehicle Speed Sensor 5-Volt Supply Circuit.

Read the Voltmeter.

Is the voltage below 4.0 volts?

All

Yes - Go To 9

No - Replace the Vehicle Speed Sensor.

.

9 - - Ignition Off

Disconnect the Oil Pressure Sending unit.

Note: Check connectors - Clean/repair as necessary.

Read the voltmeter.

Is the voltage below 4.0 volts?

All

Yes - Go To 10

No - Replace the Oil Pressure Sending unit.

10 Ignition Off

Disconnect the Throttle Position Sensor.

Note: Check connectors - Clean/repair as necessary.

Ignition On, Engine Not Running.

Measure the voltage of the Sensor Ground Circuit at TPS Connector.

Is the voltage above 1.0 volt?

All

Yes -- Repair the Sensor Ground Circuit shorted to voltage.

.

No - Go To 11

280

STARTING

* ENGINE DOES NOT START & DRB DISPLAYS NO RESPONSE -

Continued

TEST ACTION APPLICABILITY

11--- Ignition Off

Disconnect the Throttle Position Sensor.

Disconnect the Camshaft Sensor.

Disconnect the Crankshaft Sensor.

Disconnect the MAP Sensor.

Disconnect the Vehicle Speed Sensor.

Disconnect the Oil Pressure Sending Unit.

Note: Check connectors - Clean/repair as necessary.

Disconnect the Powertrain Control Module.

With an Ohmmeter, measure the resistance of the 5-Volt Primary Supply Circuit to

ground at the Powertrain Control Module Connector.

Is the resistance below 5.0 ohms?

All

Yes - Repair the shorted 5-Volt Primary Supply shorted to ground.

Perform Powertrain Verification Test VER-1.

No - Go To 12

12 Ignition Off

Disconnect the Throttle Position Sensor.

Disconnect the Camshaft Sensor.

Disconnect the Crankshaft Sensor.

Disconnect the MAP Sensor.

Disconnect the Vehicle Speed Sensor.

Disconnect the Oil Pressure Sending Unit.

Disconnect the Powertrain Control Module.

Note: Check connectors - Clean/repair as necessary.

With an Ohmmeter, measure the resistance of the 5-Volt Secondary Supply Circuit to

ground at the Powertrain Control Module Connector.

Is the resistance below 5.0 ohms?

All

Yes - Repair the shorted 5-Volt Secondary Supply shorted to ground.

Perform Powertrain Verification Test VER-1.

No - Go To 23



Edited by Scott on 10/14/2010 at 4:10 AM EST
Ask Your Own Jeep Question
Customer reply replied 7 years ago
<p>i just checked the asd relay and according to the #87 connection it is grounded is supposed to be that why i was wantin the wiring diagrams my hanes manual does not show very much</p><p>when this first happened the 15 amp fuse under the hood #1 ithink idon't have an owners manual to be sure it blowed out the guages , iterior lights, radio all went out also the under hood light is in this circuit i have disconnected this the wire that this is attached to goes to both sides of the car the one that goes to the passenger side has a rereverse ground than the one going to the drivers side so i thik it is shorted some where according to my hanes manuel it is the m1-18pk wire from what i can tell it is supposed be 12volt + i don't what else it goes to no wire digrams</p>
Ask Scott Your Own Question
Scott
Scott
Scott, Technician
Category: Jeep
Satisfied Customers: 1,190
1,190 Satisfied Customers
Experience: Dodge,Chrysler,Jeep Master Tech since 92.ASE Master since 1990.Currently Dealer employed.

Scott is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor.

Lynn B.Ormond Beach, FL

I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat.

StanSayre, PA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

< Previous | Next >

Meet the Experts:

Chris

Chris

Shop Foreman

3,449 satisfied customers

Jeep Certified Master Tech

Mark

Mark

22 Year Factory trained technician

2,593 satisfied customers

Jeep factory training........25 years in the industry.

Dave

Dave

Jeep Master Tech

1,149 satisfied customers

Chrysler Triple Master, ASE master Tech AA degree in Auto.

moparfl

moparfl

ASE Certified Technician

1,130 satisfied customers

ASE Master Tech Chrysler Dodge Jeep Master Tech

Tim Mohr

Tim Mohr

ASE MASTER TECH

1,021 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Ron Z.

Ron Z.

- Jeep Tech -

629 satisfied customers

18+yrs experience. State Inspector & Jeep Diagnostics/Repair

jeepmopar76

jeepmopar76

Jeep/Chrysler Triple Master Tech

579 satisfied customers

32yr ASE Master Tech, 9yr Chrysler Master Tech, 19 yr Jeep Dealership service including AMC/Eagle

< Previous | Next >

Related Jeep Questions
I have a 2006 Jeep Liberty CRD. Recently the engine temp is
I have a 2006 Jeep Liberty CRD. Recently the engine temp is running colder than normal and there is very little heat in the cab. Could it be anything besides the thermostat? If it is the thermostat, d… read more
Chris
Chris
Shop Foreman
3,449 satisfied customers
I have an 08' jeep wrangler. I have recently installed LED
I have an 08' jeep wrangler. I have recently installed LED tail lights and front turn signals. I have resistors on all 4 lights. All four flashers blink when I turn on the turn signal. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
What is and how does an electronic throttle control work?
what is and how does an electronic throttle control work? … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
I have a 2004 wrangler 4.0 automatic, it shifts into OD at
I have a 2004 wrangler 4.0 automatic, it shifts into OD at 45 mph and lugs down, between 45 and 60 the engine makes a humming sound if I disengage OD it stops , in OD its not noticeable after 60, also… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Why does my 1996 Grand Cherokee Larado keep [puffing smoke
why does my 1996 Grand Cherokee Larado keep [puffing white smoke when I am driving None can give me an answer I cannot chat, I am almost deaf. My email is***@******.*** … read more
Todd M
Todd M
Owner
ASE Certification
1,484 satisfied customers
I am not getting the ground to the resistor module or to the
I am not getting the ground to the resistor module or to the switch. … read more
Joecamel90
Joecamel90
Technician
Associate Degree
24 satisfied customers
Battery was change started up for a minute then cut off,
battery was change started up for a minute then cut off, will not turn over there is power and shift gear automatic but will not turn over I hear clicking iam assuming its the starter … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
01 jeep wrangler starter wire. Trying to find wire from fuse
yes and there was a swap from the 2.5 to a 5.3 with wiring issues. need to know which wire goes from fuse block to starter … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Code reader can't link on Jeep Liberty. Abs light on can't
Code was read recently , Po123 TPS changed TPS no change now cannot even link to vehicle ? … read more
jim
jim
Vocational, Technical or Trade Scho
702 satisfied customers
I have replaced the IAC and TPC I also have tried spraying
I have replaced the IAC and TPC I also have tried spraying throttle body cleaner all over vac lines and intake with no change noted. Engine will idle normally at times but most often idles high… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Trying to install a new altinator on my jeep 2001 Cherokee
trying to install a new altinator on my jeep 2001 Cherokee 4.0 … read more
roy
roy
Associate Degree
3 satisfied customers
I have a 2005 Jeep Grand Cherokee. The driver side wiper
I have a 2005 Jeep Grand Cherokee. The driver side wiper will not return to the off position and when using rides off the edge of the windshield? … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,228 satisfied customers
Jay - Toyota Camry question - I think I remember you as
Hi Jay - Toyota Camry question - I think I remember you as knowing a few things about them, right?The hood is not fully latching - my son is adding wiper fluid. I've told him all of my tricks but no l… read more
FixUrNissan
FixUrNissan
Shop Forman / Lead Tech / Parent
Vocational, Technical or Trade Scho
1 satisfied customers
My low beams went out. High beams work. Checked the fuses,
my low beams went out. High beams work. Checked the fuses, and for a minute lost one of my brake lights but it came back on. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
I have a 2008 liberty that will not start and it has the
I have a 2008 liberty that will not start and it has the stock alarm fault light in the center of the gauge cluster blinking. how can it be reset? … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
I am replacing a soft top on my 2005 wrangler X. I have
I am replacing a soft top on my 2005 wrangler X. I have purchased a new one (skin and windows only), can I use the hardware from the old soft top? … read more
Chris
Chris
Shop Foreman
3,449 satisfied customers
Security light is on in dash turn key to start and nothing.
Security light is on in dash turn key to start and nothing … read more
trung do
trung do
CERTIFICATE OF ACHIEVEMENT
98 satisfied customers
Engine light on, found gas cap off put it back on but light
engine light on, found gas cap off put it back on but light is still on … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x