FH: Generator Load Input (GLI)

FH: Introduction See: FH: Generator Load Input (GLI) - Introduction

FH1 P1244, P1245 OR P1246: CHECK IF ANY BATTERY OR CHARGING SYSTEM CONCERNS ARE PRESENT

• Check generator drive belt condition and tension.
• Verify that the battery is at proper charge.
• Verify that there are no symptoms associated with the charging system.

Does the battery and charging system appear OK?
Yes

• GO to FH2

.

No

• REFER to Battery and Charging.

FH2 CHECK GENERATOR LOAD INPUT (GLI) CIRCUIT FOR SHORT TO POWER IN HARNESS

• Disconnect voltage regulator.
• Disconnect PCM.
• Key on.
• Measure voltage between PCM harness connector Pin 59 and ground.

Is voltage less than 1.0 volts?
Yes

• KEY OFF. GO to FH3

.

No

• REPAIR short circuit.

FH3 CHECK GLI CIRCUIT FOR SHORT TO GROUND

• Disconnect scan tool from DLC.
• Measure resistance between PCM harness connector Pin 59 and ground.

Is resistance greater than 10,000 ohms?
Yes

• GO to FH4

.

No

• REPAIR short circuit.

FH4 CHECK FOR OPEN GLI CIRCUIT

• Measure resistance of the GLI circuit between PCM harness connector Pin 59 and the voltage regulator harness connector.

Is resistance less than 5.0 ohms?
Yes

• GO to FH5

.

No

• REPAIR open circuit.

FH5 CHECK PCM

• Reconnect PCM.
• Key on, engine off.
• Measure voltage between the GLI circuit at the voltage regulator harness connector and ground.

Is voltage greater than 2.0 volts?
Yes

• REFER to Charging System-General Information to verify operation of voltage regulator and

generator.

No

• REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) See: Programming and Relearning\Flash Electrically Eraseable Programmable Read Only Memory - Flash EEPROM).