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Ask Jon F Your Own Question
Jon F
Jon F, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 310
Experience:  Master Chrysler/Jeep/Dodge tech
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Having a problem with my Ram 3500 transmission

Customer Question

Having a problem with my Ram 3500 transmission
Submitted: 1 year ago.
Category: Transmissions
Expert:  Jon F replied 1 year ago.

Hi, the P0123 is a throttle position sensor code. Does your scanner show the voltage of the sensors? Also, the P0743 is probably a result of P1765.

Customer: replied 1 year ago.
I understand what the codes suggest. I am going to do a tips component test, but I need to resolve the no 2-3 upshift problem. As I state it appears the teams relay has been by passed by a jumper. The truck was shifting fine and suddenly stopped up shifting out of 2. That is what I need help resolving.
Expert:  Jon F replied 1 year ago.

Ok, well jumping 85 and 86 isn't going to send power to the trans. You'd have to jump 87 and 30. The TPS issue will definitely affect how the trans shifts also.

Expert:  Jon F replied 1 year ago.

Would you like the diagnostic procedures from Chrysler for each code?

Customer: replied 1 year ago.
That would be helpful.
Expert:  Jon F replied 1 year ago.

I'd focus on the P0123 and P1765 first. Ignore the torque converter code for now.

Symptom:

P-1765 TRANSMISSION 12V SUPPLY RELAY CONTROL CIRCUIT

When Monitored and Set Condition:

P-1765 TRANSMISSION 12V SUPPLY RELAY CONTROL CIRCUIT

When Monitored: Continuously with the key on.

Set Condition: This code is set if the voltage detected on the Transmission Relay Control

Circuit at the PCM is different than the expected voltage for 3 seconds.

POSSIBLE CAUSES

NO POSSIBLE CAUSES REMAINING

GENERATOR SOURCE CIRCUIT OPEN

TRANSMISSION CONTROL RELAY DEFECTIVE

TRANSMISSION CONTROL RELAY WIR INTERMITTENT DEF

TRANSMISSION CONTROL RELAY WIRING OBSERVABLE DEF

TRANSMISSION RELAY CONTROL CIRCUIT OPEN

TRANSMISSION RELAY CONTROL CKT SHORTED TO GROUND

POWERTRAIN CONTROL MODULE DEFECTIVE

379

TEST ACTION APPLICABILITY

1027 Key On.

Using the DRB, read the DTC’s.

Is the Specific Good Trip displayed and equal to 0?

All

Yes ® Go To 1028

No ® Go To 1034

1028 Key On.

With the DRB, actuate the Transmission Control Relay.

Is the Transmission Control Relay clicking?

All

Yes ® Go To 1034

No ® Go To 1029

1029 Key Off.

Disconnect the Transmission Control Relay.

Note: Check connectors - Clean/repair as necessary.

Key On.

With the DRB, actuate the Generator Field.

Using the DRB, measure the voltage at the Gen Source Circuit in the Relay

Connector.

Is the voltage above 10.0 volts?

All

Yes ® Go To 1030

No ® Repair the open Generator Source Circuit.

Perform Powertrain Verification Test VER-5A.

1030 Key Off.

Disconnect the Transmission Control Relay.

Note: Check connectors - Clean/repair as necessary.

Using an ohmmeter, measure the resistance between Terminals 85 and 86 of the

Trans Control Relay.

Is the resistance below 100.0 ohms?

All

Yes ® Go To 1031

No ® Replace the Transmission Control Relay.

Perform Powertrain Verification Test VER-5A.

1031 Key Off.

Disconnect the Transmission Control Relay.

Disconnect the Powertrain Control Module White Connector.

Note: Check connectors - Clean/repair as necessary.

Using an ohmmeter, measure the resistance of the Trans Relay Control Circuit from

the Relay Connector to the PCM.

Is the resistance below 5.0 ohms?

All

Yes ® Go To 1032

No ® Repair open Transmission Relay Control Circuit.

Perform Powertrain Verification Test VER-5A.

380

TRANSMISSION

P-1

ACTION APPLICABILITY

1032 Key Off.

Disconnect the Transmission Control Relay.

Note: Check connectors - Clean/repair as necessary.

Disconnect the Powertrain Control Module White Connector.

Note: Check connectors - Clean/repair as necessary.

Using an ohmmeter, measure the resistance between the Trans Relay Control Circuit

and Ground (B(-)).

Is the resistance below 5.0 ohms?

All

Yes ® Repair the Transmission Relay Control Circuit for a short to

Ground.

Perform Powertrain Verification Test VER-5A.

No ® Go To 1033

1033 If there are no potential causes remaining, the Powertrain Control Module is

assumed to be defective.

View repair options.

All

Repair

Replace the Powertrain Control Module.

Perform Powertrain Verification Test VER-5A.

1034 Key On.

The code is in the warm up cycle.

Using the DRB, go to the Freeze Frame Screen. Make sure the 9Caused By DTC9 hex

code matches the code on the DTC Screen.

Use this info for added diagnostics to help detemine the conditions when the code was

set.

Key Off.

Using the Schematic as a guide, inspect the Wiring and Connectors.

Were any problems found?

All

Yes ® Repair as necessary.

Perform Powertrain Verification Test VER-5A.

No ® Go To 1035

1035 Key On.

With the DRB, actuate the Transmission Control Relay.

Wiggle the Wiring Harness from the Relay to the Powertrain Control Module.

Did the wiggling interrupt the clicking?

All

Yes ® Repair as necessary where wiggling caused the clicking to be

interrupted.

Perform Powertrain Verification Test VER-5A.

No ® Go To 1036

1036 If there are no other possible causes remaining there is assumed to be an 9intermittent9

problem with a Wiring Harness Connector or Wire.

View repair options.

All

Repair

Visually inspect related Wire Harness Connectors and Harnesses.

Look for broken, bent, pushed out, or corroded Terminals and for

chafed, pierced, or partially broken Wire, respectively. Refer to

any hotlines or technical service bulletins that apply.

381

TRANSMISSION

P-1765 TRANSMISSION 12V SUPPLY RELAY CONTROL CIRCUIT —

765 TRANSMISSION 12V SUPPLY RELAY CONTROL CIRCUIT —

Expert:  Jon F replied 1 year ago.

Symptom:

P-0123 THROTTLE POSITION SENSOR VOLTAGE HIGH

When Monitored and Set Condition:

P-0123 THROTTLE POSITION SENSOR VOLTAGE HIGH

When Monitored: With the ignition on, and battery voltage above 10.4 volts.

Set Condition: TP sensor voltage at PCM goes above 4.9 volts for 3.2 seconds.

POSSIBLE CAUSES

NO POSSIBLE CAUSES REMAINING

THROTTLE POSITION SENSOR GROUND CIRCUIT OPEN

THROTTLE POSITION SENSOR SIGNAL CIRCUIT OPEN

TP SENSOR SIGNAL CKT SHORTED TO VOLTAGE

TPS WIRING HARNESS INTERMITTENT DEFECT (RPM)

POWERTRAIN CONTROL MODULE DEFECTIVE

THROTTLE POSITION SENSOR DEFECTIVE (A)

THROTTLE POSITION SENSOR DEFECTIVE (B)

TPS WIRING HARNESS INTERMITTENT DEFECT (VOLT)

TPS WIRING HARNESS OBSERVABLE DEFECT

59

DRIVEAB

130 Ignition On, Engine Not Running

With the DRB, read the Throttle Position (TP) Sensor voltage.

Is the TP Sensor voltage above 4.5 volts?

All

Yes ® Go To 131

No ® Go To 136

131 Ignition Off

Disconnect the Throttle Position Sensor.

Note: Check connectors - Clean/repair as necessary.

Connect a jumper wire between the TP Sensor Signal Ckt and Sensor Ground Ckt.

Ignition on, engine not running.

Using the DRB, read the TP Sensor voltage.

Is the voltage below 1.0 volt?

All

Yes ® Replace the TP Sensor.

Perform Powertrain Verification Test VER-5A.

No ® Go To 132

132 Ignition Off

Disconnect the Throttle Position Sensor Electrical Connector.

Note: Check connectors - Clean/repair as necessary.

Connect a jumper wire between the TP Sensor Signal Circuit and a good Engine

Ground.

Read the TP Sensor Voltage.

Is the voltage below 1.0 volt?

All

Yes ® Repair the open Throttle Position Sensor Ground Circuit.

Perform Powertrain Verification Test VER-5A.

No ® Go To 133

133 Ignition Off

Disconnect the Throttle Position (TP) Sensor Connector.

Note: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.

Using a Voltmeter, measure the TP Sensor Signal Circuit.

Is the voltage above 5.5 volts?

All

Yes ® Repair the TP Sensor Signal Circuit shorted to voltage.

Perform Powertrain Verification Test VER-5A.

No ® Go To 134

134 Ignition Off

Disconnect the Throttle Position Sensor.

Note: Check connectors - Clean/repair as necessary.

Disconnect the Powertrain Control Module.

Note: Check connectors - Clean/repair as necessary.

Measure resistance of the TP Sensor Signal Circuit from PCM to TP Sensor

Connector.

Is the resistance below 5.0 ohms?

All

Yes ® Go To 135

No ® Repair the open Throttle Position Sensor Signal Circuit.

Perform Powertrain Verification Test VER-5A.

60

DRIVEABILITY

P-0123 THROTTLE POSITION SENSOR VOLTAGE HIGH — Continued

APPLICABILITY

135 If there are no potential causes remaining, the Powertrain Control Module is

assumed to be defective.

View repair options.

All

Repair

Replace the Powertrain Control Module.

Perform Powertrain Verification Test VER-5A.

136 Start engine.

With the DRB, read the Throttle Position Sensor.

Start the engine and wiggle the TP Sensor Connectors and Harness.

Monitor the engine RPM.

Was there any change in engine RPM when wiggled?

All

Yes ® Repair the Harness or Connector that causes the voltage change.

Perform Powertrain Verification Test VER-5A.

No ® Go To 137

137 Ignition On, Engine Not Running

With the DRB, read the Throttle Position Sensor voltage.

While monitoring the DRB, slowly open and close the Throttle.

Is the voltage change smooth?

All

Yes ® Go To 138

No ® Replace the TP Sensor.

Perform Powertrain Verification Test VER-5A.

138 Ignition On, Engine Not Running

With the DRB, read the Throttle Position Sensor voltage.

Wiggle the TP Sensor Connectors and Harness.

Monitor the DRB display.

Was there any change in TP Sensor voltage when wiggled?

All

Yes ® Repair the Harness or Connector that causes the voltage change.

Perform Powertrain Verification Test VER-5A.

No ® Go To 139

139 Ignition Off

Using the schematic as a guide, inspect the Wiring and Connectors.

Were any problems found?

All

Yes ® Repair as necessary.

Perform Powertrain Verification Test VER-5A.

No ® Go To 140

140 Using the DRB, go to the freeze frame screen.

Make sure the ’Caused By DTC’ hex code matches the code on the DTC screen.

If so, utilize this information for added diagnostics.

If there are no other possible causes remaining, there is assumed to be an

9intermittent9 problem with a Wiring Harness Connector or Wire.

View repair options.

All

Repair

Visually inspect related Wire Harness Connectors and Harnesses.

Look for broken, bent, pushed out, or corroded terminals and for

chafed, pierced, or partially broken wire, respectively. Refer to any

hotlines or technical service bulletins that apply.

61

DRIVEABILITY

ILITY

Customer: replied 1 year ago.
I will check what I can without Chysler's DRB. I am working with an OBDII scanner and a digital mutltimeter. Cannot finish today can I contact you later?
Expert:  Jon F replied 1 year ago.

Yes that's fine. Let me know if you need any wiring diagrams.

Expert:  Jon F replied 1 year ago.

Do you follow me as far as the relay pins? 85 and 86 get a power and ground to activate the relay. 30 and 87 are connected when it's energized to turn on whatever the relay is for. To send power to the trans, you'd have to jump cavities 87 and 30 not 85 and 86.

Expert:  Jon F replied 1 year ago.

how are you making out?