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Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 24412
Experience:  ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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I have a 1994 Jeep Cherokee. 2 wheel drive.no electric

Customer Question

I have a 1994 Jeep Cherokee.*****no electric windows no central locking, not even a radio in it.
4.0 Inline 6
I have a crank no start issue.
Here's the story. I had noticed over the last 6 months, I had issues with th e speedometer. It would occaisionally die. And immediately start indicating again.
no other issue until about 5 weeks ago. On two occaisions it would crank but not start.
Then suddenly it started and I had no issue while driving.
Then it started getting worse, crank no start, I checked for spark, and noticed it was intermittant.
I changed the coil, had no issue for about a week.
Then again, crank and no spark.
research pointed to possible rotor, distributor cap, camshaft position sendor. So I changed all of those to no avail.
I changed out the Crankshaft Position sensor, it started first time.
I drove it around the block let it idle, no problem, turned it off, went inside the house came back out and again crank no start.
I now have no spark again.
I tried another computer (ecm) same issue.
I have unplugged and replugged the Map, throttle position,transmission speed sensors, cleaned all the pins with electrical contact cleaner.
still getting crank no start.
went through the sensors again. Now I get no crank and the ASD relay initiates, and if I unplug it and plug it back in after disconnecting the battery
I can put the key in and get the buzzer when openeing the door etc.
I should also point out, I have no check engine lights oil lights seatbelt lights on the instrument cluster either.
I have 12.79 volts on my battery, no blown fuses, and power to all my relays.
I am stumped, can you help?
Submitted: 9 months ago.
Category: Jeep
Expert:  bill replied 9 months ago.

have you tried pulling the fault codes yet?

do you know how to pull the codes on the early pre 1996 Chrysler/jeeps?

Customer: replied 9 months ago.
I have no check engine light. This is one of those where it blinks at you. And as soon as I turn the key now the ASD kicks in.
Expert:  bill replied 9 months ago.

exactly have you tried to pull codes?

if there is no spark there should be a code, remember PRE obd2 cars had VERY different rules than 1996 and later ones a check engine light WILL NOT illuminate with all codes

Expert:  bill replied 9 months ago.

do you know to get any codes using the key cycle method, and what they may mean?

Customer: replied 9 months ago.
I know the method. Put the key in and turn it several times to see if you get lights pulsed at you.
I just tried it again now. No lights. But it is cranking over
Customer: replied 9 months ago.
I get no check engine light. No seatbelt light. No oil light.
Customer: replied 9 months ago.
Nothing lights up and pulses at me either
Expert:  bill replied 9 months ago.

ok I have to opt out of this one this may very well be a wiring issue BUT you will need a true scan tool to properly diagnose this.

DO NOT reply or you will be locked to me and no other expert can assist

Expert:  Amedee replied 9 months ago.

Hello and welcome! My name is ***** ***** I can assist you with your question. Does the TPS and MAP sensor have 5 volts going to them with the key on?

Customer: replied 9 months ago.
I measured them the MAP sensor which if I'm correct is on the firewall bulkhead with the green plug gave me zero volts. The TPS sensor which again if I'm correct is located right under the air filter box output pipe gave me about 0.1v . I checked against the sensor ground on the plug and used the vehicle grounds as well. Same results.
Expert:  Amedee replied 9 months ago.

Ok, this is the problem. The computer is not awake. The engine will not start and run if the computer is not powered up. I would start by checking all fuses and fusible links first. If all checks out good, then you will need to check all powers and grounds going into the pcm with the key on. I see you have indicated that there are no blown fuses. However, just be sure to double and tripple check.

Expert:  Amedee replied 9 months ago.

If all fuses are good and all powers and grounds going into the pcm check out good, the PCM is bad and will need to be replaced

Expert:  Amedee replied 9 months ago.

I am glad I can help!

It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today.

Please let me know if you have any further questions.

Customer: replied 9 months ago.
Can you give me a list of sensors or something to check in order for shorts etc? I ask as I already tried another computer. It made no difference.
Customer: replied 9 months ago.
It appears that I have no low tension . It cranks with no problems. All my lights work etc.
Expert:  Amedee replied 9 months ago.

The camshaft position sensor and crankshaft position sensor are the two most common sensors to short out pulling the computer down. Don't forget to check the powers and grounds directly at the computer with the key in the on position. These two things are a must before going any further. I work until late tonight. I will be online after work when I get home after 6 PM Eastern time.

Customer: replied 9 months ago.
I have changed both those sensors. After the Crank sensor. It started and ran. For about 30 mins. I turned her off. Came back in 10 mins and that was it crank no start. I also lost the dash seatbelt and check engine lights. I changed out the computer and got the same issue. If you can tell me which pins to check I have a pinout but not sure it's the right one.
If you can let me know I'll check it first thing in the morning.
Expert:  Amedee replied 9 months ago.

Pin 3 and pin 9 should have battery voltage with the key in the "on" position

Customer: replied 9 months ago.
I have the battery voltage across those two pins.
Expert:  Amedee replied 9 months ago.

Each pin should have battery voltage on it with the key on.

Customer: replied 9 months ago.
Pin 3 has 12.79v pin 9 has about 1.5 mv
Expert:  Amedee replied 9 months ago.

Hello and sorry for the delay! That is the problem. The computer is not powered up. Try powering up pin 9 with the key on and then try starting it. I bet it will start.

Customer: replied 9 months ago.
Should I just take a feed from the battery terminal and strip the wire to pin 9 add the feed? I don't have a tool to remove the pin. Or is there a tool I can get? My question then is.if I am to fix it permanently do you know where I can take the feed from in order it only applies the battery voltage when the key is on? Sorry it's a long question!
Expert:  Amedee replied 9 months ago.

No, you cannot permantly fix this by wiring a power feed directly to this circuit. You would need to find the short or open in the wire/circuit and fix it.

Customer: replied 9 months ago.
Ok. Can you tell me where this line goes from and to? Is it direct from the fuse and relay power distribution? Or does it feed anything else on the way to the computer connection?
Expert:  Amedee replied 9 months ago.

This wire or circuit gets power directly from the ignition switch. It is a dark/blue wire from the ignition switch that feeds fuse 17 in the fuse block as well as pin 9 going into the PCM.

Customer: replied 9 months ago.
Thanks It's dark now so I'll take a look at it in the morning. I'll look for that fuse in the fuse box and see if I can't find the feed wire.
Expert:  Amedee replied 9 months ago.

Sounds good!

Expert:  Amedee replied 9 months ago.

I am glad I can help!

It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today.

Please let me know if you have any further questions.

Customer: replied 9 months ago.
Sorry fir the delay I. Responding. Got a bout the Flu right now. Do you have a diagram of the fusebox? All I find are diagrams up to fuse 16.
Expert:  Amedee replied 9 months ago.

This is what I have.

DENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 1 - 25 AMP (NATURAL)
Rear Window Wiper, Washer.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 2 - 15 AMP (LT. BLUE)
Radio, Cigar Lighter, Dome Lamp (1993).

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 3 - NOT USED
Not Used.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 4 - 15 AMP (LT. BLUE)
Flash to Pass.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 5 - 25 AMP (NATURAL) (1992)
Blower Motor.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 6 - 30 AMP (CIRCUIT BREAKER)
Power Windows.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 7 - 2 AMP (PINK)
Antilock Brakes (ABS).

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 8 - 20 AMP (YELLOW)
Turn Signal Flasher.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 9 - 10 AMP (RED)
Radio/Clock & Memory, Courtesy Lights, Glove Box, Cargo, Dome Lamps, Telltales.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 10 - NOT USED
Not Used.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 11 - 25 AMP (NATURAL)
Headlamp Delay Module, Horns.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 12 - NOT USED
Not Used.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 13 - 20 AMP (YELLOW)
Power Door Locks.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 14 - NOT USED
Not Used.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 15 - 15 AMP (LT. BLUE)
Instrument Panel Lamps, Clock, Radio/Clock & Memory, Headlamp Switch, Parking Lamps.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 16 - 30 AMP (CIRCUIT BREAKER)
Power Seats, Trailer Tow.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 17 - 7.5 AMP (VIOLET)
Instrument Cluster Guages, Headlamp Delay Module, Chime Module, Overhead Console.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 18 - 25 AMP (NATURAL)
Heated Rear Window.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 19 - 5 AMP (TAN)
Instrument Panel Lamps, Radio Illumination.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (PASSENGER COMPARTMENT) > 20 - 5.5 AMP (CIRCUIT BREAKER)

Customer: replied 9 months ago.
That's different from my fuse box I have the rectangular type mounted in the passenger side engine bay
Expert:  Amedee replied 9 months ago.

Is it a relay box?

Customer: replied 9 months ago.
it has relays in it as well. I found an image online of what it looks like
Expert:  Amedee replied 9 months ago.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 1 - 60 AMP (BLUE)

Generator Output.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 2 - 30 AMP (GREEN)

Engine Control (ECU) - Fuel Pump, Injectors, Ignition Coil, Oxygen Sensors, Generator Field, Engine Controller Automatic Transmission Controller (ATCU).

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 3 - 40 AMP (ORANGE)

Fuse Block.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 4 - 20 AMP (YELLOW)

Hazard Lamps.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 5 - 40 AMP (ORANGE)

Headlamp Switch.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 6 - 50 AMP (RED)

Ignition Switch - Engine Controller, Fuel Pump Relay, Automatic Shutdown Relay Coil.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 7 - 40 AMP (ORANGE)

Heated Rear Window, Starter Solenoid.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 8 - 40 AMP (ORANGE)

ABS Pump Motor.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 9 - 60 AMP (BLUE)

Generator Output.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 10 - 30 AMP (GREEN)

ABS System.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 11 - 15 AMP (BLUE)

Ignition Switch - Back-up Lamps, A/C Relay Coil, Shift Selector, Speed Control, Aux. Cooling Fan Relay Coil.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 12 - 10 AMP (RED)

Automatic Transmission.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 13 - 15 AMP (BLUE)

Auxilliary Lamps - Fog Lamps, Underhood Lamps.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 14 - 20 AMP (YELLOW)

Engine Controller.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 15 - 20 AMP (YELLOW)

Aux. Cooling Fan.

IDENTIFICATION > FUSE & CIRCUIT BREAKER I.D. (POWER DISTRIBUTION) > 16 - 10 AMP (RED)

Ignition Off Draw (1993), Radio/Clock Memory, Ignition Off Draw, Dome Courtesy (1994-95).

IDENTIFICATION > RELAY IDENTIFICATION (POWER DISTRIBUTION)

  • A - Aux. Cooling Fan Relay
  • B - Fuel Pump Relay
  • C - ABS Pump Relay
  • D - Air Conditioning Relay
  • E - Auto Shutdown Relay
  • F - Starter Relay
  • G - ABS System Relay

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