Chrysler Town, Dodge Caravan. Manual — part 581
Symptom:
P0508 - IAC MOTOR SENSE CIRCUIT LOW
When Monitored and Set Condition:
P0508 - IAC MOTOR SENSE CIRCUIT LOW
When Monitored:
Engine running. The batterty voltage greater than 10 volts.
Set Condition:
IAC Valve Sense current is less than 146.33 mA for 500 milli seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
IAC MOTOR
IAC MOTOR DRIVER CIRCUIT SHORTED TO GROUND
IAC MOTOR SENSE CIRCUIT OPEN
IAC MOTOR SENSE CIRCUIT SHORTED TO GROUND
IAC MOTOR DRIVER 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 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.
132
DRIVEABILITY - SBEC
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the Powertrain Control Module harness connectors.
Measure the resistance of the IAC Motor Sense circuit from the PCM harness
connector to the IAC Motor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the open in the IAC Sense 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 of the IAC Motor Sense in the IAC Motor harness connector
to ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short to ground in the IAC Motor Sense circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the Powertrain Control Module harness connectors.
Measure the resistance of the IAC Motor Driver circuit from the PCM harness
connector to the IAC Motor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the IAC Motor Driver circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the IAC Motor Driver circuit in the IAC Motor harness
connector to ground.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the IAC Motor Driver 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 in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
133
DRIVEABILITY - SBEC
P0508 - IAC MOTOR SENSE CIRCUIT LOW —
Continued
Symptom:
P0509 - IAC MOTOR SENSE CIRCUIT HIGH
When Monitored and Set Condition:
P0509 - IAC MOTOR SENSE CIRCUIT HIGH
When Monitored:
Engine running. The batterty voltage greater than 10 volts.
Set Condition:
IAC Valve Sense current is greater than 999.9 mA for 500 milli seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
IAC MOTOR
IAC MOTOR SENSE CIRCUIT SHORTED TO VOLTAGE
IAC MOTOR DRIVER CIRCUIT SHORTED TO VOLTAGE
IAC MOTOR SENSE CIRCUIT SHORTED TO IAC MOTOR DRIVER 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
134
DRIVEABILITY - SBEC
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Turn the ignition on.
With the DRBIII
t, actuate the ASD Relay.
Measure the voltage of the IAC Motor Sense circuit in the IAC Motor harness
connector.
Is the voltage above 0.5 of a volt?
All
Yes
→ Repair the short to voltage in the IAC Motor Sense circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Turn the ignition on.
With the DRBIII
t, actuate the ASD Relay.
Measure the voltage of the IAC Motor Driver circuit in the IAC Motor harness
connector.
Is the voltage above 0.5 of a volt?
All
Yes
→ Repair the short to voltage in the IAC Motor Driver circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the IAC Motor harness connector.
Measure the resistance across the IAC Motor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the shorted to the IAC Motor Driver circuit IAC Motor
Sense circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 6
6
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 in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
135
DRIVEABILITY - SBEC
P0509 - IAC MOTOR SENSE CIRCUIT HIGH —
Continued
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст