Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1130

7.

FRONT CONTROL MODULE

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.

Were there any problems found?

Yes

>> Repair as necessary.

Perform BODY VERIFICATION TEST-VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)

No

>> Replace and program the Powertrain Control Module per Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)

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ENGINE ELECTRICAL DIAGNOSTICS

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P0551-POWER STEERING PRESSURE SWITCH PERFORMANCE

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition key on and engine running.

•

Set Condition:
With the vehicle above 40 m.p.h. for over 30 seconds, the power steering pressure switch remains open. Two
Trip Fault. Three good trips to turn off the MIL.

Possible Causes

(K66) P/S SWITCH SIGNAL CIRCUIT OPEN

(K66) P/S SWITCH SIGNAL CIRCUIT SHORTED TO GROUND

(Z988) GROUND CIRCUIT OPEN

POWER STEERING PRESSURE SWITCH

PCM

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

Diagnostic Test

1.

ACTIVE DTC

Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes

>> Go To 2

No

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

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

2.

POWER STEERING PRESSURE SWITCH

Turn the ignition off.

Disconnect the Power Steering Pressure Switch harness connector.

Ignition on, engine not running.

Connect a jumper wire to the (K66) P/S Switch Signal circuit at the
Power Steering Pressure Switch harness connector.

Use the scan tool to monitor the Power Steering Pressure Switch sta-
tus.

Touch the other end of the jumper wire to the (Z988) Ground circuit at
the Power Steering Pressure Switch harness connector several times.

Did the Power Steering Pressure Switch status change from
High to Low when connecting and disconnecting the jumper
wire?

Yes

>> Replace the Power Steering Pressure Switch.

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

No

>> Go To 3

NOTE: Remove the jumper wire before continuing.

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ENGINE ELECTRICAL DIAGNOSTICS

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3.

(K66) P/S SWITCH SIGNAL CIRCUIT HIGH RESISTANCE

Turn the ignition off.

Disconnect the PCM harness connector.

CAUTION: CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will
damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815
along with the 8815-1 to perform the diagnosis.
Using a voltmeter perform a voltage drop test. Backprobe the (K66) P/S Switch Signal circuit at the P/S Switch
Sensor harness connector to the appropriate terminal of the special tool #8815. Ensure the voltmeter leads are
connected with the circuit’s correct polarity.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands
near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in
personal injury or death.
Start the engine and allow it to reach normal operating temperature.

Monitor the voltmeter.

Is the voltage below 0.5 volts?

Yes

>> Go To 4

No

>> Repair the high resistance in the (K66) P/S Switch Signal circuit.

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

4.

(Z988) GROUND CIRCUIT OPEN

Turn the ignition off.

Using a 12-volt test light connected to battery voltage, probe the (Z988) Ground circuit in the Power Steering Pres-
sure Switch connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connec-
tion to the battery.

Does the test light illuminate brightly?

Yes

>> Go To 5

No

>> Repair the (Z988) Ground circuit.

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

5.

PCM

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.

Were there any problems found?

Yes

>> Repair as necessary.

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

No

>> Replace and program the Powertrain Control Module per Service Information.

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

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ENGINE ELECTRICAL DIAGNOSTICS

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P0562-BATTERY VOLTAGE LOW

For a complete wiring diagram Refer to Section 8W.

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ENGINE ELECTRICAL DIAGNOSTICS

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