0043-02 Ignition Key Switch Fault (71)

104

TM 9-2320-312-24-2

Troubleshooting Section

Results:

i01643942

0064-02 Loss of Engine RPM

OK STOP.

Signal #2 (34)

i01638595

SMCS Code: 1408-081; 1907-038

0043-02 Ignition Key Switch

Conditions Which Generate This Code:

Fault (71)

The signal for the camshaft position sensor 2

SMCS Code: 1416-038; 1553-038

(bottom) is intermittent or lost.

Conditions Which Generate This Code:

System Response:

This indicates that the battery circuit to the ignition

Electronic System Response The check engine

key switch has an intermittent condition or a low

lamp will not be illuminated for this code unless the

battery condition while the engine is running.

code has been active for 10 hours. The code is

logged.

Note: This code can be generated by rapidly

cycling the ignition key switch. Some control

Engine Response There should not be a noticeable

modules on the vehicle require this action in order

change in engine response unless the signal for the

to prompt flash codes. If this occurs, clear the

camshaft position sensor 1 (top) is lost. This loss

logged diagnostic codes in order to prevent future

will shut down the engine.

confusion or an incorrect diagnosis.

Troubleshooting:

Note: This code can also be generated when an

attempt is made in order to restart the engine

Perform the following diagnostic procedure: "Engine

immediately after a shutdown. The engine may not

Speed/Timing Sensor Circuit - Test"

start if the engine speed did not reach 0 rpm prior

to the restart.

Results:

System Response:

OK STOP.

Electronic System Response The ECM may stop

the fuel injection process. This response depends

i01643944

on the amount of time that occurs in the fault mode.

0064-11 No Pattern on Speed

Sensor #2 (34)

Engine Response The engine may experience

burps in engine rpm, and engine shutdowns that

are intermittent or complete.

SMCS Code: 1907-038

Service Tool Display or Lamps Caterpillar

Conditions Which Generate This Code:

Electronic Technician (ET) will display the state of

the ignition key switch on the status screen. The

The signal for the camshaft position sensor 2

Check Engine Lamp and the Warning Lamps may

(bottom) is lost.

come on as if the ignition key switch was turned on

and the engine started.

System Response:

Troubleshooting:

Electronic System Response The check engine

lamp will not be illuminated for this code unless the

Perform the following diagnostic procedure: "Ignition

code has been active for 10 hours. The code is

Key Switch Circuit and Battery Supply Circuit - Test"

logged.

Results:

Engine Response There should not be a noticeable

change in engine response unless the signal for the

OK STOP.

camshaft position sensor 1 (top) is lost. This loss

will shut down the engine.