odometer ISUZU KB P190 2007 Workshop User Guide

ELECTRICAL-BODY AND CHASSIS 8A-343
TROUBLESHOOTING
SPEEDOMETER
1. Speedometer and odometer do not function

Checkpoint Trouble Cause Countermeasure


Replace the vehicle speed
sensor

Vehicle speed sensor
malfunction

NG

Repair an open circuit in the
circuit or a poor connection at
the connectors Continuity between the vehicle
speed sensor and the meter,
or the fuse C14 (10A) and the
ground

Open circuit or poor connector
contact


Replace the case baseboard
assy

Use a meter tester to check
the speedometer function

Speedometer malfunction

NG
NG
OK
OK
Check the vehicle speed
sensor output
(4 pulses/1 rotation)




2. Speedometer pointer fluctuates
(May be wide fluctuation)

Replace the vehicle speed
sensor, or repair an open
circuit in the circuit or a
connectors Vehicle speed sensor
malfunction, or open circuit or
poor connector contact

NG


Replace the case baseboard
assy

Use a meter tester to check
the speedometer function

Speedometer malfunction

NG
OK
Check the speed sensor
output by using the
oscilloscope




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8A-344 ELECTRICAL-BODY AND CHASSIS
3. Speedometer pointer jumps erratically

Checkpoint Trouble Cause Countermeasure

Replace the vehicle speed
sensor, or repair an open
circuit in the circuit or a poor
connection at the connectors Vehicle speed sensor
malfunction, or open circuit or
poor connector contact

NG


Replace the meter assembly

Use meter tester to check the
speedometer function

Speedometer malfunction

NG
OK
Check the vehicle speed
sensor output by using the
oscilloscope





Inspection of a Waveform by Oscilloscope
(Reference)


RTW 780SH000101

1. Connect a resistance of 1.3 to 5k ohm (1.4W or more)
between the harness side connectors 40
B23 and 16

B24 of the meter.

2. Install a speedometer tester.
3. Turn on the starter SW .



RTW 580SH002201

4. Check the waveform at the time when the vehicle speed is
at 60km/h.



4. Trip odometer does not reset


Replace the meter assembly

Faulty reset mechanism

NG
Check at other kilometer
figures given by meter tester
(Reset should be made to
zero kilometer)


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8A-362 ELECTRICAL-BODY AND CHASSIS
Tachometer Off-Vehicle Inspection
Remove the tachometer from the meter assembly and
measure the resistance value and the current consumption
between each terminal.


SELF DIAGNOSTIC FUNCTION
Check that the speedometer, tachometer, fuel gauge, and
temperature gauge operate properly.

821R300033


Entering the self-diagnostic mode
1. Push in and hold the “Change Indicator and Reset” knob.
2. Turn the ignition ON.
3. W hen the LCD odometer turns ON, release the “Change Indicator and Reset” knob.
4. Push in and release the “Change Indicator and Reset” knob three times in quick succession.
The meter cluster is now in “Self-diagnostic” mode.
NOTE: Steps 2-4 must be performed within 7 seconds.
The meter cluster will not enter “Self-diagnostic” mode if any of
the following conditions occur:
1. The “Change Indicator and Reset” knob is not depressed when the ignition is turned ON.
2. The “Change Indicator and Reset” knob is released within 600ms of turning the ignition ON.
3. The “Change Indicator and Reset” knob is not depressed and released three times within 7 seconds.


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ELECTRICAL-BODY AND CHASSIS 8A-363

Self –diagnostic mode
LCD condition
• All LCDs are lit during the transition from self-diagnostic
decision mode to self-diagnostic mode
• The odometer/trip indicator scrolls throng its entire range
approximately once every 600 ms. All digits are lit (segment
check indication). This continues until the self-diagnostic
mode is terminated.

Meter and gauge indications
Meter and gauge indications with the change indicator and
reset knob on (self-diagnostic mode) are as shown in the
following table.




RTW 78ASF000101


Speedometer 100 kilometers per hour
Tachometer 3,000 rpm
Fuel gauge
Temperature gauge Mid-point on the dial

All indications return to zero when the change indicator and
reset knob is turned off.
The self-diagnostic mode and the self-diagnostic decision
mode are cancelled when the ignition switch is turned to the
OFF position. They also cancel when a speed pulse is sensed.
If either of the self-diagnostic modes are cancelled by turning
the ignition switch to the OFF position, the diagnostic unit
remains in the stand-by condition.
If cancellation occurs when a speed pulse is sensed, the unit
remains in the ordinary operating condition.



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