"CHECK TRANS" Check

Abnormal

Fig 1: Identifying Check Trans Indicator Blinking Pattern - Abnormal

Courtesy of ISUZU MOTOR CO.

Indicator is ON during 2- 3 seconds at ignition (or when the engine is cranked) but it is OFF after the engine starts. The indicator is working normally GO TO DIAGNOSTIC CHECK .

Fig 2: Locating Check Trans Indicator
Courtesy of ISUZU MOTOR CO.

Normal

Fig 3: Identifying Check Trans Indicator Blinking Pattern - Normal
Courtesy of ISUZU MOTOR CO.
Indicator is flashing and the flash is 0.2 seconds ON and 0.2 seconds OFF always when ignition is on (engine cranked or not). This means that there is a malfunction. GO TO DIAGNOSTIC CHECK .
Abnormal

Fig 4: Identifying Check Trans Indicator Blinking Pattern - Abnormal
Courtesy of ISUZU MOTOR CO.
Indicator is staying ON always when Ignition is ON.
1. This means that connection between the lamp and the indicator control unit is shorted to ground.
2. Verify if instrument panel terminal 27 of connector I -24 is shorted to ground.
3. Verify if the indicator control unit connector B-16 terminal 20 is shorted to ground.
4. Verify that the instrument panel terminal 14 of connector I-24 is connected to battery.
5. If problem solved: GO TO CHECK TRANS INDICATOR .
  NO: Replace Powertrain Control Module (PCM).
Indicator is staying OFF with the ignition ON (engine OFF).
1. This means that connection between the lamp and the indicator control unit is shorted to battery or opened.
2. Verify if instrument panel terminal 27 of connector I -24 is shorted to battery or open.
3. Verify if the indicator control unit connector B-16 terminal 20 is shorted to battery or open.
4. Verify that the instrument panel terminal 14 of connector I-24 is connected to battery. If not, check the fuses and the connections (terminal 7 of connector H-17) voltage.
5. If problem solved: GO TO CHECK TRANS INDICATOR .
  NO: Replace Powertrain Control Module (PCM).
Fig 5: PCM And ICU Connection Circuit Diagram
Courtesy of ISUZU MOTOR CO.