jump cable ISUZU TROOPER 1995 User Guide

8-294 CHASSIS ELECTRICAL
DIAGNOSIS
QUICK CHART FOR CHECK POINTS
1. Speedometer
Trouble mode Check
point
1-1 Speedometer
and odometer do not function
1-2 Speedometer does not function (Odometer is normal)
1-3 Odometer does not function (Speedometer is normal)
1-4 Speedometer needle fluctuates
(May be wide fluctuation)
1-5 Speedometer
needle jumps erratically Speedometer
0 (3)
0 (1)
0 (1)
0 (3)
0 (3)
NOTE: Figure
in parenthesis "( )" indicates the order of inspection.
2. Tachometer
Check point Tachometer Trouble mode
2-1 Tachometer does not function 0 (3)
2-2 Tachometer needle fluctuates 0
(May be wide fluctuation) (3)
2-3 Tachometer needle jumps erratically 0 (3)
NOTE: Figure in parenthesis "( )" indicates the order of inspection.
3. Voltmeter
Check point Meter
Trouble mode
assembly
3-1 Voltmeter needle does not move 0 (2)
3-2 Voltage reading is too low (high) 0 (2)
NOTE: Figure in parenthesis "( )" indicates the order of inspection.
4. Engine coolant temperature (ECT) gauge
Vehicle speed
Cable harness
sensor
0 0 (1) (2)
0
0 (1) (2)
0 0 (1) (2)
Ignition control
Cable harness
module
0 0
(1) (2)
0 0 (1) {2)
0 0 (1) (2)
Voltmeter Cable
harness
0 0 (3) (1)
0
0 (3) (1)
Check point Meter ECT Thermo Thermo-Cable
Trouble mode
assembly gauge unit stat harness
4-1 Gauge needle does not move 0
0 0
0
(3) (4) (2) (1)
4-2 Gauge reading is too low 0 0 0 0 0
(or high) (4) (5) (3) (1) (2)
4-3 Needle overshoots 0 0 0 0
(or goes up to the "H" range). (3) (4) (1) (2)
NOTE: Figure in parenthesis "( )" indicates the order of inspection.
..

CHASSIS ELECTRICAL 8-297
1-4. NEEDLE FLUCTUATES
(MAY
BE WIDE FLUCTUATION)
• DOES THE VEHICLE SPEED SENSOR OUTPUT
NORMALLY?
I
I
l
YES ~ THE OSCILLOSCOPE WAVEFORM IS DEFORMED
I r
REPLACE THE SPEEDOMETER I REPLACE THE VEHICLE SPEED SENSOR, OR REPAIR
A POOR CONNECTION AT THE CONNECTORS IN THE
CIRCUIT OR A FAILURE IN THE CABLE HARNESS
1-5. SPEEDOMETER NEEDLE JUMPS ERRATICALLY
• DOES THE VEHICLE SPEED SENSOR OUTPUT
NORMALLY?
I
YES I AN ABNORMAL PERIODIC WAVEFORM IS OUTPUT BY
OSCILLOSCOPE
I
REPLACE THE SPEEDOMETER I REPLACE THE VEHICLE SPEED SENSOR, OR REPAIR A POOR CONNECTION AT THE CONNECTORS IN THE CIRCUIT OR A FAILURE IN THE CABLE HARNESS

2-2 TACHOMETER NEEDLE FLUCTUATES
(MAY
BE WIDE FLUCTUATION)
I· IS THE PULSE INPUT NORMAL? I
I
I
f YES l
I
I REPLACE THE TACHOMETER I
CHASSIS ELECTRICAL 8-299
I
NO j
l
THE WAVEFORM BY OSCILLOSCOPE IS DEFORMED. (ABNORMAL INPUT)
I
REPLACE THE DIS CONTROLLER, OR REPAIR A POOR
CONNECTION OF THE CONNECTORS IN THE CIRCUIT OR A FAILURE IN THE CABLE HARNESS
2-3 TACHOMETER NEEDLE JUMPS ERRATICALLY
I· IS THE PULSE INPUT NORMAL? I
I
I
I
I YES I NO j
I I
I REPLACE THE TACHOMETER I AN ABNORMAL PERIODIC WAVEFORM IS OUTPUT BY OSCILLOSCOPE
I
REPLACE THE IGNITON CONTROL MODULE, OR REPAIR A POOR CONNECTION OF THE CONNECTORS IN THE CIRCUIT OR A FAILURE IN THE HARNESS