Schematic Reference: Engine Controls Schematics , Power Distribution Schematics in Wiring Systems, and Ground Distribution Schematics in Wiring Systems

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

1. Turn OFF the ignition.
2. Remove the ignition 1B relay from the relay block 5.
3. Probe the ignition 1B relay battery positive voltage, hot at all times, circuit with a test lamp connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems.

Does the test lamp illuminate?

Go to Step 3

Go to Step 8

3

1. Turn ON the ignition, with the engine OFF.
2. Probe the ignition 1B relay, ignition 1 voltage, hot in Run and Start, circuit at relay block 5 with a test lamp connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 9

4

1. Turn ON the ignition, with the engine OFF.
2. Probe the ignition 1B relay coil ground circuit terminal at relay block 5, with a test lamp connected to 12 volts.

Does the test lamp illuminate?

Go to Step 5

Go to Step 10

5

1. Turn OFF the ignition.
2. Jump ignition 1B relay battery positive voltage circuit and the ignition 1B relay load circuit together using a fused jumper wire. Refer to Using Fused Jumper Wires in Wiring Systems.
3. Remove the odd injector and even injector circuit breakers from relay block 5.
4. Probe the ignition 1B relay switched B+ feed terminals in relay block 5, for the above circuit breakers, with a test lamp connected to a good ground.

Does the test lamp illuminate for both circuit breaker terminals listed?

Go to Step 6

Go to Step 11

Inspect for poor terminal contact at the ignition 1B relay electrical connector in relay block 5. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 7

Replace the ignition 1B relay.

Did you complete the replacement?

Go to Step 12

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Repair the open or short to ground in the battery positive supply to the ignition 1B relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 12

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Repair the open or short to ground in the ignition 1B voltage, hot in Run and Start, circuit to the ignition 1B relay.

Did you complete the repair?

Go to Step 12

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Repair the open circuit or high resistance in the ignition 1B relay coil ground circuit.

Did you complete the repair?

Go to Step 12

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Repair the open circuit or high resistance in the ignition 1B relay load circuit.

Did you complete the repair?

Go to Step 12

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1. Remove all test equipment except the scan tool.
2. Reconnect any disconnected components, circuit breakers, etc.
3. Turn OFF ignition for 30 seconds.
4. Start the engine and operate vehicle.
5. Observe the MIL, vehicle performance, and driveability.

Does the vehicle operate normally, with no MIL illumination and no stored DTCs?

System OK

Go to Diagnostic Trouble Code (DTC) List