Chrysler 300M 2002 Service Manual page 2639

DRIVEABILITY - NGC
P0508-IAC VALVE SENSE CIRCUIT LOW —
TEST
3 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the IAC Motor Sense circuit from the IAC Motor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 4
→ Repair the open in the IAC Sense circuit.
No
4 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the IAC Motor Sense in the IAC Motor
harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the IAC Motor Sense circuit.
→ Go To 5
No
5 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the IAC Motor Driver circuit in the IAC
Motor harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the IAC Motor Driver circuit.
→ Go To 6
No
6 Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the IAC Motor Driver circuit from the IAC Motor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 7
→ Repair the open in the IAC Motor Driver circuit.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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