Chrysler Pacifica. Manual — part 370
Symptom:
P0508-IAC VALVE SENSE CIRCUIT LOW
When Monitored and Set Condition:
P0508-IAC VALVE SENSE CIRCUIT LOW
When Monitored:
Engine running. Battery voltage greater than 10 volts.
Set Condition:
The IAC sense circuit is less than 175 mA. One Trip Fault.
POSSIBLE CAUSES
IAC MOTOR OPERATION
IAC MOTOR
(K61) IAC MOTOR CONTROL CIRCUIT SHORTED TO GROUND
(K961) IAC RETURN CIRCUIT OPEN
(K961) IAC RETURN CIRCUIT SHORTED TO GROUND
(K61) IAC MOTOR CONTROL CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: If the engine will not idle, maintain an engine speed between 800 and
1500 RPM.
Start the engine.
Allow the engine to idle.
With the DRBIII
t, read the IAC Current.
Is the IAC Current below 146 mA?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Remove the IAC Motor.
NOTE: Inspect the IAC air passages for restriction and damage to the IAC
valve.
Measure the resistance across the IAC Motor terminals (component side).
Is the resistance 9.7 +/- 1.0 ohms?
All
Yes
→ Go To 3
No
→ Replace the IAC Motor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2005 CS POWERTRAIN
Publication No. 81-370-05182
September, 2004
201
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
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 (K961) IAC Return 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 Return circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K961) IAC Return in the IAC Motor
harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K961) IAC Return circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K61) IAC Motor 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 Motor Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 6
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 (K61) IAC Return 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 7
No
→ Repair the open in the (K61) IAC Motor Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2005 CS POWERTRAIN
Publication No. 81-370-05182
September, 2004
202
DRIVEABILITY - NGC
P0508-IAC VALVE SENSE CIRCUIT LOW —
Continued
TEST
ACTION
APPLICABILITY
7
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2005 CS POWERTRAIN
Publication No. 81-370-05182
September, 2004
203
DRIVEABILITY - NGC
P0508-IAC VALVE SENSE CIRCUIT LOW —
Continued
Symptom:
P0509-IAC VALVE SENSE CIRCUIT HIGH
When Monitored and Set Condition:
P0509-IAC VALVE SENSE CIRCUIT HIGH
When Monitored:
Engine running. Battery voltage greater than 10 volts.
Set Condition:
The IAC sense circuit is greater than 980 mA. One Trip Fault.
POSSIBLE CAUSES
IAC MOTOR OPERATION
IAC MOTOR
(K961) IAC RETURN CIRCUIT SHORTED TO VOLTAGE
(K61) IAC MOTOR CONTROL CIRCUIT SHORTED TO VOLTAGE
(K961) IAC RETURN CIRCUIT SHORTED TO (K61) IAC MOTOR CONTROL CIRCUIT
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: If the engine will not idle, maintain an engine speed between 800 and
1500 RPM.
Start the engine.
Allow the engine to idle.
With the DRBIII
t, read the IAC Current.
Is the IAC Current above 999 mA?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Turn the ignition off.
Disconnect the IAC Motor harness connector.
With the DRBIII
t, monitor the IAC Current.
Turn the ignition on.
Does the DRBIII
t display IAC Current at 0mA?
All
Yes
→ Replace the IAC Motor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
2005 CS POWERTRAIN
Publication No. 81-370-05182
September, 2004
204
DRIVEABILITY - NGC
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