Dodge Ram Truck 1500-2500-3500. Manual — part 1245

P0505-IDLE AIR CONTROL MOTOR CIRCUITS (CONTINUED)

4.

(K39) IAC #3 DRIVER CIRCUIT SHORTED TO THE (K59) IAC #4 DRIVER CIRCUIT

NOTE: The following steps are checking for a short between the
Driver Circuits.
Measure the resistance between the (K39) IAC #3 Driver circuit and
the (K59) IAC #4 Driver circuit.

Is the resistance below 100 ohms?

Yes

>> Repair the short between the IAC Driver circuits.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

No

>> Go To 5

5.

IAC DRIVER CIRCUITS SHORTED TO VOLTAGE

Remove the ASD Relay.

Using a jumper wire, jumper between the (A14) Fused B+ circuit and
(K342) ASD Relay Output circuit in the PDC.

Ignition on, engine not running with the PCM and IAC harness con-
nectors disconnected.

Measure the voltage on each of the IAC Driver circuits.

Is the voltage above 1.0 volt at any IAC Driver circuit?

Yes

>> Repair the short to voltage on the appropriate IAC Driver

circuit.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

No

>> Go To 6

NOTE: Remove the jumper wire and install the ASD Relay before
continuing.

9 - 1902

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P0505-IDLE AIR CONTROL MOTOR CIRCUITS (CONTINUED)

6.

IAC DRIVER CIRCUITS SHORTED TO GROUND

Turn the ignition off.

Repeat each measurement for each IAC Driver circuit.

Measure the resistance between ground and each IAC Driver circuit.

Is the resistance below 100 ohms at any IAC Driver circuit?

Yes

>> Repair the short to ground in the appropriate IAC Driver

circuit.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

No

>> Go To 7

7.

IAC MOTOR OPERATION

Turn the ignition off.

Connect the C1 PCM harness connectors.

Start and idle the engine.

Using a test light connected to ground, probe the IAC Driver #1 circuit
for 10 seconds.

Repeat the above test for the remaining IAC Motor Driver circuits.

Does the test light turn on and off while probing each IAC
Motor Driver circuits?

Yes

>> Replace the Idle Air Control Motor.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

No

>> Replace and program the Powertrain Control Module per

Service Information.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

9 - 1903

P0522-OIL PRESSURE CIRCUIT LOW

9 - 1904

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P0522-OIL PRESSURE CIRCUIT LOW (CONTINUED)

For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition on.

•

Set Condition:
When the PCM recognizes the Oil Pressure signal voltage lower than 0.3 of a volt.

Possible Causes

(F855) 5-VOLT SUPPLY CIRCUIT OPEN

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

OIL PRESSURE SENSOR

(G6) OIL PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND

(G6) OIL PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

1.

OIL PRESSURE SENSOR VOLTAGE BELOW 0.1 VOLT

Start the engine.

With the scan tool in Sensors, read the Oil Pressure Sensor voltage.

Is the Oil Pressure Sensor voltage below 0.1 of a volt?

Yes

>> Go To 2

No

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

2.

(F855) 5-VOLT SUPPLY CIRCUIT

Turn the ignition off.

Disconnect the Oil Pressure Sensor harness connector.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit in the Oil Pres-
sure Sensor harness connector.

Is the voltage between 4.5 to 5.2 volts?

Yes

>> Go To 3

No

>> Go To 6

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

9 - 1905