FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Chrysler >> 2003 >> Sebring Coupe V6-3.0L VIN H >> Repair and Diagnosis >> Transmission and Drivetrain >> Transmission Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Diagnosis By Symptom >> Inspection Procedure >> Inspection Procedure 15

Inspection Procedure 15

INSPECTION PROCEDURE 15: Vehicle Shifts Differently with A/C Engaged

Part 1 Of 6:




Part 2 Of 6:




Part 3 Of 6:




Part 4 Of 6:




Part 6 Of 6:








Dual Pressure Switch System Circuit

CIRCUIT OPERATION
- When the A/C is turned ON and the dual pressure switch is closed, PCM (terminal number 83) receives battery voltage and then determines the A/C compressor has been signaled to engage.
- When the A/C compressor is engaged, the PCM increases line pressure and briefly delays shift points to compensate for the additional engine load.

COMMENT
The cause is probably a faulty dual pressure switch circuit or a defective PCM.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of the dual pressure switch
- Damaged harness, connector
- Malfunction of A/C system
- Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
- MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool M13991502, check data list item 65, Dual Pressure Switch.

CAUTION: To prevent damage to scan tool M13991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool M13991502.





1) Connect scan tool MB991502 to the data link connector.
2) Start the engine and run at idle.
3) Set scan tool MB991502 to data reading mode for item 65, Dual Pressure Switch.
- When the A/C is in operation, the scan tool MB991502 display should be "ON."
- When the A/C is not in operation, the scan tool MB991502 display should be "OFF."

4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Go to Step 2.

STEP 2. Check dual pressure switch connector A-36 for loose, corroded or damaged terminals, or terminals pushed -back in the connector.





Q: Are the connectors and terminals in good condition?
YES: Go to Step 3.
NO: Repair or replace the damaged components.

STEP 3. Measure the power supply voltage at dual pressure switch connector A-36.





1) Disconnect the connector A-36 and measure at the harness side.
2) Start the engine and run at idle.
3) Operate the A/C.





4) Measure the voltage between terminal 2 and ground.
- Voltage should measure battery positive voltage.

5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage battery positive voltage?
YES: Go to Step 10.
NO: Go to Step 4.

STEP 4. Measure the power supply voltage at automatic compressor controller connector C-14 by backprobing.





1) Do not disconnect connector C-14.
2) Start the engine and run at idle.
3) Operate the A/C.





4) Measure the voltage between terminal 4 and ground by backprobing.
- Voltage should measure battery positive voltage.

5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage battery positive voltage?
YES: Go to Step 8.
NO: Go to Step 5.

STEP 5. Check intermediate connector C-212 and automatic compressor controller connector C-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 6.
NO: Repair or replace the damaged components.

STEP 6. Check the harness for short circuit to ground between dual pressure switch connector A-36 terminal 2 and automatic compressor controller connector C-14 terminal 4.








Q: Is the harness wire in good condition?
YES: Go to Step 7.
NO: Repair or replace the harness wire.

STEP 7. Using scan tool M139911502, check data list item 65, Dual Pressure Switch.

CAUTION: To prevent damage to scan tool M13991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool M13991502.





1) Connect scan tool MB991502 to the data link connector.
2) Start the engine and run at idle.
3) Set scan tool MB991502 to data reading mode for item 65, Dual Pressure Switch.
- When the A/C is in operation, the scan tool display should be "ON."
- When the A/C is not in operation, the scan tool display should be "OFF."

4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Check the air conditioning system.

STEP 8. Check intermediate connector C-212 and automatic compressor controller connector C-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 9.
NO: Repair or replace the damaged components.

STEP 9. Check the harness for open circuit between dual pressure switch connector A-36 terminal 2 and automatic compressor controller connector C-14 terminal 4.








Q: Is the harness wire in good condition?
YES: Go to Step 14.
NO: Repair or replace the harness wire.

STEP 10. Measure the switch output voltage at PCM connector C-117 <2.4L Engine> or C-119 <3.0L Engine> by backprobing.





1) Do not disconnect connector C-1 17 <2.4L Engine> or C-1 19 <3.0L Engine>.
2) Start the engine and run at idle.
3) Operate the A/C.





4) Measure the voltage between terminal 83 and ground by backprobing.
- When the A/C is in operation, the voltage should measure battery positive voltage.

5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage battery positive voltage?
YES: Go to Step 15.
NO: Go to Step 11.

STEP 11. Check intermediate connectors C-25, C-212 and PCM connector C-1 17 <2.41- Engine> or C-1 19 <3.01Engine> for loose, corroded or damaged terminals, or terminals pushed back in the connector.











Q: Are the connectors and terminals in good condition?
YES: Go to Step 12.
NO: Repair or replace the damaged components.

STEP 12. Check harness for open circuit or short circuit to ground between dual pressure switch connector A-36 terminal 1 and PCM connector C-117 <2.4L Engine> or C119 <3.0L Engine> terminal 83.








Q: Is the harness wire in good condition?
YES: Go to Step 13.
NO: Repair or replace the harness wire.

STEP 13. Check the dual pressure switch.

Q: Is the switch operating properly?
YES: Go to Step 14.
NO: Replace the dual pressure switch.

STEP 14. Using scan tool V113991502, check data list item 65, Dual Pressure Switch.

CAUTION: To prevent damage to scan tool M13991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool M13991502.





1) Connect scan tool MB991502 to the data link connector.
2) Start the engine and run at idle.
3) Set scan tool MB991502 to data reading mode for item 65, Dual Pressure Switch.
- When the A/C is in operation, the scan tool display should be "ON."
- When the A/C is not in operation, the scan tool display should be "OFF."

4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the PCM.

STEP 15. Check PCM connector C-117 <2.4L Engine> or C119 <3.0L Engine> for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connectors and terminals in good condition?
YES: Go to Step 14.
NO: Repair or replace the damaged components.
pro multis Credits:Operation CHARM About Operation CHARM