TEST
ACTION
APPLICABILITY
3
Disconnect the C2 PCM harness connector.
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 (K961) IAC Signal circuit from the IAC Motor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the open in the (K961) IAC Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Measure the resistance between ground and the (K961) IAC Signal circuit in the IAC
Motor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K961) IAC Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
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 (K61) IAC Control circuit from the IAC Motor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (K61) IAC Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Measure the resistance between ground and the (K61) IAC Control circuit in the IAC
Motor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K61) IAC Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 7
7
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
189
DRIVEABILITY - NGC
P0508-IAC VALVE SIGNAL CIRCUIT LOW —
Continued