Chrysler Voyager. Manual — part 97

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

(K39) IAC MOTOR CONTROL CIRCUIT SHORTED TO GROUND

(K60) IAC SIGNAL CIRCUIT OPEN

(K60) IAC SIGNAL CIRCUIT SHORTED TO GROUND

(K39) 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 - NGC.

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 pin terminals (component).
Is the resistance 9.7 +/- 1.0 ohms?

All

Yes

→ Go To 3

No

→ Replace the IAC Motor.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

387

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 (K60) 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 (K60) IAC Signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

4

Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K60) IAC Signal in the IAC Motor
harness connector.
Is the resistance below 100 ohms?

All

Yes

→ Repair the short to ground in the (K60) IAC Signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

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 (K39) 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 (K39) IAC Motor Control circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

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 (K39) 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 (K39) IAC Motor Control circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.

388

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 - NGC.

389

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

(K60) IAC SIGNAL CIRCUIT SHORTED TO VOLTAGE

(K39) IAC MOTOR CONTROL CIRCUIT SHORTED TO VOLTAGE

(K60) IAC SIGNAL CIRCUIT SHORTED TO (K39) 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 - NGC.

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 - NGC.

No

→ Go To 3

390

DRIVEABILITY - NGC