0070-05 Inlet Air Heater Open Circuit (49)

105

TM 9-2320-312-24-2

Troubleshooting Section

Troubleshooting:

Perform the following diagnostic procedure: "Air

Perform the following diagnostic procedure: "Engine

Inlet Heater Circuit - Test"

Speed/Timing Sensor Circuit - Test"

Results:

OK STOP.

i01643948

i01638606

0070-05 Inlet Air Heater Open

0071-00 Idle Shutdown

Circuit (49)

Override (01)

SMCS Code: 1408-081; 1907-038

SMCS Code: 1900-038; 1901-038

Conditions Which Generate This Code:

The ECM has detected an open circuit after

The brake pedal or the clutch pedal is depressed

attempting to activate the air inlet heater.

during the last 90 seconds of the idle shutdown

mode after the Check Engine Lamp begins to flash.

The "Allow Idle Shutdown Override" parameter must

System Response:

be programmed to "YES".

Electronic System Response The ECM is unable

to activate the air inlet heater.

Note: This diagnostic code represents an event. This

diagnostic code does not represent an electronic

Engine Response The engine may be difficult to

system fault.

start in the cold temperature and the exhaust may

emit white smoke.

System Response:

Electronic System Response The idle shutdown

Troubleshooting:

timer stops counting. The idle shutdown timer will

Perform the following diagnostic procedure: "Air

not begin counting again for shutdown until the

Inlet Heater Circuit - Test"

vehicle is moved and the accelerator pedal is

depressed. The diagnostic code requires Customer

Passwords in order to be cleared from memory.

Results:

OK STOP.

Service Tool Display or Lamps Caterpillar

Electronic Technician (ET) will display "OVERRIDE"

next to "Idle Shutdown" on the status screen. This

i01387630

code does not illuminate the Check Engine Lamp.

0070-06 Inlet Air Heater Short

Engine Response The only effect on engine

Circuit (49)

response is the fact that the engine will not shut

down until the timer has been reset. The timer

SMCS Code: 1090-038; 1408-081

is reset by moving the vehicle or cycling the

keyswitch. The timer can also be reset by quickly

Conditions Which Generate This Code:

depressing the accelerator pedal and quickly

releasing the accelerator pedal.

The ECM has detected an open circuit or an short

circuit after attempting to activate the air inlet heater.

Note: The Timer cannot be overridden by using the

service brakes or by using the clutch if the "Allow

System Response:

Idle Shutdown Override" parameter is programmed

to NO.

Electronic System Response The ECM is unable

to activate the air inlet heater.

Troubleshooting:

Engine Response The engine may be difficult to

Perform the following diagnostic procedure: "Idle

start in the cold temperature and the exhaust may

Shutdown Timer - Test"

emit white smoke.