SPN 1267 - FMI 3 (Fault Code 338)
Saturday, July 14, 2018
Fault Codes CUMMINS GTA38 K38 K50 QSK38 QSK50/60 CM850,
Fault Codes CUMMINS Signature ISX QSX15 CM570
SPN1267 FMI3
Idle Shutdown Vehicle Accessories Relay Driver Circuit - Voltage Above Normal or Shorted to High Source
CODES:
Fault Code: 338
PID(P), SID(S): S87
SPN: 1267
FMI: 3/3
Lamp: Amber
SRT:
REASON: Open circuit or short to voltage source detected at the idle shutdown vehicle accessory/ ignition bus relay circuit.
EFFECT: Vehicle accessories or ignition bus loads controlled by the idle shutdown relay will not
power up.
Circuit Description:
The Engine Control Module (ECM) Idle Shutdown feature has an optional parameter for a shutdown accessory relay. When this parameter is set to ?Installed?, the ECM sends a signal to energize the relay and turn off vehicle accessories during idle shutdown events. The idle shutdown relay return circuit varies by Original Equipment Manufacturer (OEM). The return circuit can be returned to the ECM through the ECM Return (General) or connected directly to ground. Refer to the OEM service manual to determine grounding configuration.
Component Location:
The idle shutdown relay location varies by OEM. Refer to the OEM service manual to determine the location.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the idle shutdown relay pulse width modulated (PWM) signal was at system voltage when the pulse width modulated (PWM) signal was commanded OFF.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails. The accessories controlled by the idle shutdown relay will be disabled.
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
The ECM monitors the voltage level on this circuit. If it detects a voltage when the signal is commanded off, it records this fault code. This fault code can be caused by:
-ECM Idle Shutdown feature set up incorrectly.
-Open circuit in the idle shutdown relay, OEM harness, or connectors.
-Short circuit to a voltage source in the OEM harness or relay.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 629 - FMI 12 (Fault Code 343)
SPN 1267 - FMI 4 (Fault Code 339)
Blog.Teknisi
Idle Shutdown Vehicle Accessories Relay Driver Circuit - Voltage Above Normal or Shorted to High Source
 |
| Idle Shutdown Vehicle Accessories Relay Driver Circuit |
CODES:
Fault Code: 338
PID(P), SID(S): S87
SPN: 1267
FMI: 3/3
Lamp: Amber
SRT:
REASON: Open circuit or short to voltage source detected at the idle shutdown vehicle accessory/ ignition bus relay circuit.
EFFECT: Vehicle accessories or ignition bus loads controlled by the idle shutdown relay will not
power up.
Circuit Description:
The Engine Control Module (ECM) Idle Shutdown feature has an optional parameter for a shutdown accessory relay. When this parameter is set to ?Installed?, the ECM sends a signal to energize the relay and turn off vehicle accessories during idle shutdown events. The idle shutdown relay return circuit varies by Original Equipment Manufacturer (OEM). The return circuit can be returned to the ECM through the ECM Return (General) or connected directly to ground. Refer to the OEM service manual to determine grounding configuration.
Component Location:
The idle shutdown relay location varies by OEM. Refer to the OEM service manual to determine the location.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the idle shutdown relay pulse width modulated (PWM) signal was at system voltage when the pulse width modulated (PWM) signal was commanded OFF.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails. The accessories controlled by the idle shutdown relay will be disabled.
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
The ECM monitors the voltage level on this circuit. If it detects a voltage when the signal is commanded off, it records this fault code. This fault code can be caused by:
-ECM Idle Shutdown feature set up incorrectly.
-Open circuit in the idle shutdown relay, OEM harness, or connectors.
-Short circuit to a voltage source in the OEM harness or relay.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 629 - FMI 12 (Fault Code 343)
SPN 1267 - FMI 4 (Fault Code 339)
Blog.Teknisi
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