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Instructor jp
Instructor jp, Technical Instructor Master ASE
Category: Dodge
Satisfied Customers: 315
Experience:  14 Years manufacture instructor
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2001 dodge ram 1500: my truck has a 5.9 with an a/t 4x4

Customer Question

I have a 2001 dodge ram 1500 today it showed a code p1762 and p1763 my truck has a 5.9 with an a/t 4x4. what needs to be fixed
Submitted: 5 years ago.
Category: Dodge
Expert:  Instructor jp replied 5 years ago.

Hello coop,

 

It may be you just have a bad transmission solenoid and you should replace the pressure sensor with it. I have included a fix for a short to voltage on the downstream o2 sensor. Something to check before throwing parts at the truck.

 

 

1762 governor pressure off set to high or to low. try to see if you have a wiring issue from the following:

If the downstream O2 is shorted to voltage, it can set a P1763 governor pressure voltage high and downstream O2 sensor shorted to voltage.

Do you have a trailer tow harness??

 

Unplug the brake switch and check the input on the O2 signal wire at the PCM. The voltage read normal. Reconnect the brake switch and cut the O2 sensor signal wire at the PCM. The voltage on the harness side will be high but the governor pressure read normal. The wiring above the fuel tank to melt and get into the downstream O2 sensor signal wire. The shorted O2 sensor signal wire was feeding back through the PCM into the governor pressure sensor circuit.

 

see if any of this helps as it has been to be true on more than one truck.

Customer: replied 5 years ago.
it was wired factory with the towing package! what color wires will i need to look at im good with wireing but need a little help on all the steps and wire colors and what and were to unplug
Expert:  Instructor jp replied 5 years ago.

 

Here all all the diagrams for the tow harness wiring. The task is to follow the harness from the tow plug and pay close attention as it goes around or over the fuel tank. If you find no evidence of the wires touching thru the insulation that is all good.

Next :You will need the factory scan tool after that to see what the pressure solenoid is doing.

 

jp

 

 

8154d288

8154d28d

8154d28c

8154d28b

Expert:  Instructor jp replied 5 years ago.

Here is the o2 diagram.

 

The brake switch test is to unplug the connector at the back pedal.

 

8154d196

Customer: replied 5 years ago.
ok i will look and let you know what i find
Expert:  Instructor jp replied 5 years ago.

Remember this is just a concern on a few vehicles that has happened. Yours may just be in the transmission..

 

jp

Customer: replied 5 years ago.
ok i understand thank you i wont forget about you
Expert:  Instructor jp replied 5 years ago.

Thank you

 

jp

Customer: replied 5 years ago.
what wire is the O2 signal wire at the PCM what color still no luck fixed both sensors still have the problem
Expert:  Instructor jp replied 5 years ago.

Hello coop,

 

The diagram is in the post above. THe signal wire for the up stream 1/1 is Black and dark green stripe. The down stream wire sensor wire is Light green with a red stripe.

 

jp

 

POWERTRAIN CONTROL MODULE C1 (GAS) - BLACK 32 WAY

CAVCIRCUITFUNCTION
1K32 18YL/GY (8.0L)IGNITION COIL NO. 4 DRIVER
2F18 18LG/BKFUSED IGNITION SWITCH OUTPUT (RUN-START)
3K18 18RD/BK (8.0L)IGNITION COIL NO. 3 DRIVER
4K4 18BK/LBSENSOR GROUND
5K43 18DG/GY (8.0L)IGNITION COIL NO. 5 DRIVER
6T41 18BK/WT (A/T)PARK/NEUTRAL POSITION SWITCH SENSE
7K19 16BK/GY (3.9L/5.2L/5.9L)IGNITION COIL NO. 1 DRIVER
7K19 18BK/GY (8.0L)IGNITION COIL NO. 1 DRIVER
8K24 18GY/BKCRANKSHAFT POSITION SENSOR SIGNAL
9K17 18DB/WT (8.0L)IGNITION COIL NO. 2 DRIVER
10K60 18YL/BKIDLE AIR CONTROL NO. 2 DRIVER
11K40 18BR/WTIDLE AIR CONTROL NO. 3 DRIVER
12--
13G113 18ORPTO SWITCH SENSE
14--
15K21 18BK/RDINTAKE AIR TEMPERATURE SENSOR SIGNAL
16K2 18TN/BKENGINE COOLANT TEMPERATURE SENSOR SIGNAL
17K6 18VT/WT5V SUPPLY
18K44 18TN/YLCAMSHAFT POSITION SENSOR SIGNAL
19K39 18GY/RDIDLE AIR CONTROL NO. 1 DRIVER
20K59 18VT/BKIDLE AIR CONTROL NO. 4 DRIVER
21--
22A14 16RD/WTFUSED B(+)
23K22 18OR/DBTHROTTLE POSITION SENSOR SIGNAL
24K141 18TN/WT (3.9L/5.2L/5.9L) (CALIFORNIA EXCEPT 8.0L)OXYGEN SENSOR 1/1 SIGNAL
24K41 18BK/DG (5.9L HD/8.0L)OXYGEN SENSOR 1/1 SIGNAL
25K341 18OR/BK (3.9L/5.2L) (CALIFORNIA)OXYGEN SENSOR 1/2 SIGNAL
25K341 18OR/BK (8.0L)OXYGEN SENSOR 1/3 SIGNAL
26K241 18LG/RD (8.0L) (5.9L HD)OXYGEN SENSOR 2/1 SIGNAL
26K241 18LG/RD (CALIFORNIA)OXYGEN SENSOR 2/1 SIGNAL
27K1 18DG/RDMAP SENSOR SIGNAL
28--
29K441 18OR/TN (CALIFORNIA)OXYGEN SENSOR 2/2 SIGNAL
29K141 18TN/WT (8.0L)OXYGEN SENSOR 1/2 SIGNAL
30--
31Z12 14BK/TNGROUND
32Z12 14BK/TNGROUND

 

POWERTRAIN CONTROL MODULE C2 (GAS) - BLACK 32 WAY

CAVCIRCUITFUNCTION
1T54 18VT (A/T)TRANSMISSION TEMPERATURE SENSOR SIGNAL
2K26 18VT/TN (5.2L/5.9L/8.0L)FUEL INJECTOR NO. 7 DRIVER
3K115 18TN/BK (8.0L)FUEL INJECTOR NO. 9 DRIVER
4K11 18WT/DBFUEL INJECTOR NO. 1 DRIVER
5K13 18YL/WTFUEL INJECTOR NO. 3 DRIVER
6K38 18GYFUEL INJECTOR NO. 5 DRIVER
7--
8K88 18VT/WT (A/T)GOVERNOR PRESSURE SOLENOID CONTROL
9--
10K20 18DGGENERATOR FIELD
11K54 18OR/BKTORQUE CONVERTER CLUTCH SOLENOID CONTROL
12K58 18BR/DBFUEL INJECTOR NO. 6 DRIVER
13K28 18GY/LB (5.2L/5.9L/8.0L)FUEL INJECTOR NO. 8 DRIVER
14K116 18WT (8.0L)FUEL INJECTOR NO. 10 DRIVER
15K12 18TNFUEL INJECTOR NO. 2 DRIVER
16K14 18LB/BRFUEL INJECTOR NO. 4 DRIVER
17--
18--
19--
20--
21T60 18BR (A/T)3-4 SHIFT SOLENOID CONTROL
22--
23G60 18GY/ORENGINE OIL PRESSURE SENSOR SIGNAL
24--
25T13 18DB/BK (A/T)OUTPUT SPEED SENSOR GROUND
26--
27G7 18WT/OR (A/T)VEHICLE SPEED SENSOR SIGNAL
28T14 18LG/BK (A/T)OUTPUT SPEED SENSOR SIGNAL
29T25 18LG/WT (A/T)GOVERNOR PRESSURE SENSOR SIGNAL
30K30 18PK (A/T)TRANSMISSION CONTROL RELAY CONTROL
31K7 18OR (A/T)5V SUPPLY
32--

POWERTRAIN CONTROL MODULE C3 (GAS) - BLACK 32 WAY

CAVCIRCUITFUNCTION
1C13 18DB/ORA/C COMPRESSOR CLUTCH RELAY CONTROL
2--
3K51 18DB/YLAUTOMATIC SHUT DOWN RELAY CONTROL
4V36 18TN/RDSPEED CONTROL VACUUM SOLENOID CONTROL
5V35 18LG/RDSPEED CONTROL VENT SOLENOID CONTROL
6--
7--
8K199 18BR/VT (CALIFORNIA)OXYGEN SENSOR 1/1 HEATER CONTROL
9K145 20DG/PK (CALIFORNIA)OXYGEN SENSOR DOWNSTREAM RELAY CONTROL
10K106 18WT/DGLEAK DETECTION PUMP SOLENOID CONTROL
11V32 18YL/RDSPEED CONTROL SUPPLY
12A142 14DG/ORAUTOMATIC SHUT DOWN RELAY OUTPUT
13T6 18OR/WT (A/T)OVERDRIVE OFF SWITCH SENSE
14K107 18ORLEAK DETECTION PUMP SWITCH SENSE
15K118 18PK/YLBATTERY TEMPERATURE SENSOR SIGNAL
16K299 18BR.WTOXYGEN SENSOR 2/1 HEATER CONTROL
17--
18--
19K31 18BR/WTFUEL PUMP RELAY CONTROL
20K52 18PK/WTEVAPORATIVE EMISSION SOLENOID CONTROL
21--
22C20 18BRA/C SWITCH SENSE
23C90 18LG/WTA/C SELECT INPUT
24V40 18WT/PKBRAKE SWITCH SENSE
25T125 18DBGENERATOR SOURCE
26K226 18DB/WTFUEL LEVEL SENSOR SIGNAL
27D21 18PK/DBSCI TRANSMIT
28D2 18WT/BKCCD BUS (-)
29D20 18DGSCI RECEIVE
30D1 18VT/BRCCD BUS (+)
31--
32V37 18RD/LGSPEED CONTROL SWITCH SIGNAL

Customer: replied 5 years ago.
what power should the o2 sensor have also if the truck is running in park should the gov sensor have power?
Customer: replied 5 years ago.
also the plugs on my pcm are black white black yours says they are all black? i can clear the computer and as soon as i restart the engine the code is their again this thing is buggin me
Expert:  Instructor jp replied 5 years ago.

Sorry this is factory wiring diagram. C2 will be the middle connector

Yes governor has power and a pulse width modulated signal that will change as needed for pressure increase. 02 sensors will be 0 to 1.2 volts switching several times a second between .2 and .8 volts.

what is the code number that is coming back?

Customer: replied 5 years ago.
P1762
Expert:  Instructor jp replied 5 years ago.

Hello coop,

 

This code is the transmission pressure sensor to high volts or to low. It is not necessarily a sensor failure. There is something influencing this code. THe code will set after seeing this problem for three times in a row. It may be a bad governor pressure solenoid common. You should also replace the sensor as calibration has changed from old to new.

 

jp

Customer: replied 5 years ago.
both sensors were replaced
Expert:  Instructor jp replied 5 years ago.

If you are sure the wiring is correct You are left with two parts with the need to use a scan tool to make sure one or the other is bad.

1 Valve body

2 PCM

 

I strongly recommend you have this confirmed with a Dodge scan tool before replacing any thing else.

 

jp

Expert:  Instructor jp replied 5 years ago.

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