P0207

SYMPTOM
P0207-FUEL INJECTOR 7 CIRCUIT

WHEN MONITORED
With battery voltage greater than 10 volts. Auto Shutdown Relay energized. Engine speed less than 3000 rpm.

SET CONDITION
No inductive spike is detected after injector turn off.

POSSIBLE CAUSES
- (K342), (A955) ASD RELAY OUTPUT CIRCUIT
- (K26) INJECTOR CONTROL NO.7 CIRCUIT OPEN
- (K26) INJECTOR CONTROL NO.7 CIRCUIT SHORTED TO GROUND
- FUEL INJECTOR
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Scan Tool Testing and Procedures

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>> Perform POWERTRAIN VERIFICATION TEST VER-5. Powertrain Verification Test - Ver 5

2. (K342), (A955) ASD RELAY OUTPUT CIRCUIT





Note: The circuit id (K342) is used on vehicles equipped with a 5.7L engine and the (A955) circuit id is used on vehicles equipped with a 4.7L engine.

Turn the ignition off.
Disconnect the No.7 Fuel Injector harness connector.
Ignition on, engine not running.
With the scan tool, actuate the ASD Relay.
Using a 12-volt test light connected to ground, backprobe the (K342), (A955) ASD Relay Output circuit in the No.7 Fuel Injector harness connector.
Does the test light illuminate brightly?
Yes>> Go To 3
No>> Repair the excessive resistance or short to ground in the
(K342), (A955) ASD Relay Output circuit. Perform POWERTRAIN VERIFICATION TEST VER-5.

3. FUEL INJECTOR





Using a 12-volt test light connected to 12-volts, backprobe the (K26) Injector Control No.7 circuit. With the scan tool, actuate the No.7 Fuel Injector.
What is the state of the test light during the actuation?
Brightly Blinking.
Replace the Fuel Injector. Perform POWERTRAIN VERIFICATION TEST VER-5.
ON Constantly.
Go To 4
OFF Constantly.
Go To 5

4. (K26) INJECTOR CONTROL NO.7 CIRCUIT SHORTED TO GROUND





Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K26) Injector Control No.7 circuit in the Injector harness connector.
Is the resistance below 100 ohms?
Yes>> Repair the short to ground in the (K26) Injector Control No.7 circuit. Perform POWERTRAIN VERIFICATION TEST VER-5.
No>> Go To 6

5. (K26) INJECTOR CONTROL NO.7 CIRCUIT OPEN





Turn the ignition off.
Disconnect the PCM harness connectors.

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 to perform diagnosis.

Measure the resistance of the (K26) Injector Control No.7 circuit from the Fuel Injector harness connector to the appropriate terminal of special tool # 8815.
Is the resistance below 5.0 ohms?
Yes>> Go To 6
No>> Repair the open in the (K26) Injector Control No.7 circuit. Perform POWERTRAIN VERIFICATION TEST VER-5.

6. 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 (NGC) POWERTRAIN VERIFICATION TEST VER-5.
No>> Replace and program the Powertrain Control Module per Service Information. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.