Pinpoint Test P : P193E
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
- P1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using a diagnostic scan tool, carry out the network test.
Do the BCM and the PCM pass the network test?
Yes GO to P2. No DIAGNOSE the BCM or PCM does not communicate with the diagnostic scan tool. REFER to Module Communications Network . - P2 CHECK THE PCM AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PID
- Start the engine.
- Using a diagnostic scan tool, monitor the PCM AC_REQ PID.
- On the HVAC controls, select PANEL mode, then press the A/C button (indicator ON).
Does the PID display Yes when the A/C button indicator is illuminated?
Yes GO to P5. No GO to P3. - P3 CHECK THE FCIM (A/C) SWITCH (CC_SW_AC) PID WITH THE A/C ON
- Start the engine.
- Using a diagnostic scan tool, monitor the FCIM CC_SW_AC PID.
- Select PANEL and press the A/C button (indicator on) on the HVAC controls.
Does the PID display Active when the button is pressed and the indicator is illuminated?
Yes GO to P5. No GO to P4. - P4 CHECK FOR CORRECT HVAC CONTROL MODULE OPERATION
- Disconnect and inspect all HVAC control module connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect all HVAC control module connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new HVAC control module. REFER to Climate Control . No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. - P5 CHECK FOR CORRECT PCM OPERATION
- Disconnect and inspect all PCM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect all PCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new PCM. REFER to Electronic Engine Controls . No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.