Symptom Chart

WARNING: This page is about a different car, the 2002 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

PROBLEM SYMPTOM CHART

Condition	Possible Sources	Action
No Communication With The Generic Electronic Module (GEM).	Central junction Box (CJB) Fuse 26 (7.5A) Battery Junction Box (BJB) Fuse 11 (50A) Circuitry. GEM.	REFER To MULTIFUNCTION ELECTRONIC CONTROL MODULES .
No Communication With The 4-Wheel Drive (4WD) Module	BJB Fuse 13 (20A) Circuitry 4WD Control Module	REFER To FOUR-WHEEL DRIVE SYSTEMS .
Incorrect Fuel Gauge Indication	Circuitry Fuel Level Sender Fuel Gauge Fuel Tank Instrument Cluster Gauge Amplifier Instrument Cluster Printed Circuit	Go To INPOINT TEST A: INCORRECT FUEL GAUGE INDICATION .
Incorrect Temperature Gauge Indication	Circuitry. Water Temperature Indicator Sender Unit Engine Coolant Temperature Gauge Instrument Cluster Printed Circuit	Go To PINPOINT TEST B: INCORRECT TEMPERATURE GAUGE INDICATION .
Incorrect Oil Pressure Gauge Indication	Circuitry Oil Pressure Switch Instrument Cluster Printed Circuit Gauge	Go To PINPOINT TEST C: INCORRECT OIL PRESSURE GAUGE INDICATION .
Incorrect Voltage Gauge Indication	Circuitry Gauge Instrument Cluster Printed Circuit	REFER to GENERATORS & REGULATORS .
Inaccurate Speedometer Reading	Speedometer	Go To PINPOINT TEST D: INACCURATE SPEEDOMETER READING .
The Speedometer/Odometer Is Inoperative	Circuitry Speedometer Instrument Cluster Printed Circuit	Go To PINPOINT TEST E: THE SPEEDOMETER/ODOMETER IS INOPERATIVE .
The Tachometer Is Inoperative	Powertrain Control Module (PCM) Circuitry Tachometer Instrument Cluster Printed Circuit	Go To PINPOINT TEST F: THE TACHOMETER IS INOPERATIVE .
Incorrect Tachometer Indication	Circuitry Instrument Cluster Printed Circuit Tachometer	Go To PINPOINT TEST G: INCORRECT TACHOMETER INDICATION .
The Charge System Warning Indicator Is Never On	CJB fuse 11 (7.5A) Circuitry Charge System Warning Indicator Bulb Instrument Cluster Printed Circuit	Go To PINPOINT TEST H: THE CHARGE SYSTEM WARNING INDICATOR IS NEVER ON .
Charge System Warning Indicator Is Always On	Charging System	REFER To GENERATORS & REGULATORS .
The Anti-Lock Brake Warning Indicator Is Inoperative	Anti-Lock Warning Indicator Bulb Circuitry Instrument Cluster Printed Circuit Anti-lock Brake System (ABS) Module	Go To PINPOINT TEST I: THE ANTI-LOCK BRAKE WARNING INDICATOR IS INOPERATIVE .
The Anti-Lock Brake Warning Indicator Is Always On	ABS Concern	Refer To ANTI-LOCK CONTROL .
The Anti-Theft Alarm Indicator Is Inoperative	Anti-Theft Alarm Indicator LED Circuitry Instrument Cluster Printed Circuit PCM	Refer To ANTI-THEFT .
The Anti-Theft Alarm Indicator Is Always On	Passive Anti-Theft System (PATS).	Refer To ANTI-THEFT .
The CHECK FUEL CAP Indicator Is Inoperative	CHECK FUEL CAP Indicator Bulb PCM Circuitry Instrument cluster printed circuit	Go To PINPOINT TEST J: THE CHECK FUEL CAP INDICATOR IS INOPERATIVE .
The CHECK FUEL CAP Indicator Is Always On	Circuitry	REFER To SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV .
The High Beam Indicator Is Inoperative	High Beam Indicator Bulb. Circuitry. Instrument Cluster Printed Circuit.	Go To PINPOINT TEST K: THE HIGH BEAM INDICATOR IS INOPERATIVE .
The CHECK ENGINE/malfunction Indicator Lamp (MIL) Indicator Is Inoperative	CHECK ENGINE/MIL Bulb Circuitry Instrument Cluster Printed Circuit PCM	Go To PINPOINT TEST L: THE CHECK ENGINE/MALFUNCTION INDICATOR LAMP (MIL) INDICATOR IS INOPERATIVE .
The CHECK ENGINE/MIL Indicator Is On Continuously	Powertrain/Emissions Concern	REFER To SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV .
The LH Turn Signal Indicator Is Inoperative	LH Turn Signal Indicator Bulb Circuitry Instrument Cluster Printed Circuit	Go To PINPOINT TEST M: THE LH TURN SIGNAL INDICATOR IS INOPERATIVE .
The RH Turn Signal Indicator Is Inoperative	RH Turn Signal Indicator Bulb Circuitry Instrument Cluster Printed Circuit	Go To PINPOINT TEST N: THE RH TURN SIGNAL INDICATOR IS INOPERATIVE .
The O/D Off Indicator Is Inoperative	O/D OFF Indicator Bulb Circuitry Dimmer Control Relay Headlamp Switch Instrument Cluster Printed Circuit	Go To PINPOINT TEST O: THE O/D OFF INDICATOR IS INOPERATIVE .
The overdrive Off Indicator Is Always On	Circuitry PCM	REFER to TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS .
The Speed Control Indicator Is Always On	Circuitry Speed Control Servo	REFER To VEHICLE SPEED CONTROL .
The Speed Control Indicator Is Never On	Speed Control Indicator Bulb Circuitry Dimmer Control Relay Headlamp Switch Instrument Cluster Printed Circuit	Go To PINPOINT TEST P: THE SPEED CONTROL INDICATOR IS NEVER ON .
The Brake Warning Indicator Is Inoperative	Brake Warning Indicator Bulb Circuitry Parking Brake Switch Brake Fluid Level Switch Instrument Cluster Printed Circuit	Go To PINPOINT TEST Q: THE BRAKE WARNING INDICATOR IS INOPERATIVE .
The Brake Warning Indicator Is Always On	Parking Brake Brake Master Cylinder Reservoir Parking Brake Switch Circuitry Instrument Cluster Printed Circuit	REFER To DISC & DRUM .
The CHECK GAUGE Indicator Is Inoperative	CHECK GAUGE Indicator Bulb Circuitry Fuel Gauge Instrument Cluster Gauge Amplifier Instrument Cluster Printed Circuit	Go To PINPOINT TEST R: THE CHECK GAUGE INDICATOR IS INOPERATIVE .
The Door Ajar Indicator Does Not Operate Correctly	Door Ajar Indicator Bulb Circuitry GEM Instrument Cluster Printed Circuit	Go To PINPOINT TEST S: THE DOOR AJAR INDICATOR DOES NOT OPERATE CORRECTLY .
The Safety Belt Warning Indicator Does Not Operate Correctly	Safety Belt Warning Indicator Bulb Circuitry GEM Instrument Cluster Printed Circuit	Go To PINPOINT TEST T: THE SAFETY BELT WARNING INDICATOR DOES NOT OPERATE CORRECTLY .
The 4x4 HIGH, 4x4 LOW Indicator Is Inoperative	4x4 HIGH Or 4x4 LOW Indicator Bulb Circuitry 4WD Control Module Instrument Cluster Printed Circuit	Go To PINPOINT TEST U: THE 4X4 HIGH, 4X4 LOW INDICATOR IS INOPERATIVE .
The Air Bag Indicator Is Inoperative	Air Bag Indicator Bulb Circuitry Instrument Cluster Printed Circuit	Go To PINPOINT TEST V: THE AIR BAG INDICATOR IS INOPERATIVE .
The Air Bag Indicator Is Always On	Circuitry Air Bag Diagnostic Monitor	REFER To AIR BAG RESTRAINT SYSTEMS .