SPN 1267 - FMI 4 (Fault Code 339)
Saturday, July 14, 2018
Fault Codes CUMMINS GTA38 K38 K50 QSK38 QSK50/60 CM850,
Fault Codes CUMMINS Signature ISX QSX15 CM570
SPN1267 FMI4
Idle Shutdown Vehicle Accessories Relay Driver Circuit - Voltage Below Normal or Shorted to Low Source
CODES:
Fault Code: 339
PID(P), SID(S): S87
SPN: 1267
FMI: 4/4
Lamp: Amber
SRT:
REASON: Low voltage detected at the idle shutdown vehicle accessory or ignition bus relay circuit when commanded ON.
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 NOT at system voltage when the pulse width modulated (PWM) signal was commanded ON.
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. This fault code is logged if it detects a low voltage when the relay signal is commanded on. This fault code can be caused by a short circuit to ground in the idle shutdown relay, OEM harness, or connectors.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 191 - FMI 16 (Fault Code 349)
SPN 629 - FMI 12 (Fault Code 343)
Blog.Teknisi
Idle Shutdown Vehicle Accessories Relay Driver Circuit - Voltage Below Normal or Shorted to Low Source
 |
| Idle Shutdown Vehicle Accessories Relay Driver Circuit |
CODES:
Fault Code: 339
PID(P), SID(S): S87
SPN: 1267
FMI: 4/4
Lamp: Amber
SRT:
REASON: Low voltage detected at the idle shutdown vehicle accessory or ignition bus relay circuit when commanded ON.
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 NOT at system voltage when the pulse width modulated (PWM) signal was commanded ON.
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. This fault code is logged if it detects a low voltage when the relay signal is commanded on. This fault code can be caused by a short circuit to ground in the idle shutdown relay, OEM harness, or connectors.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 191 - FMI 16 (Fault Code 349)
SPN 629 - FMI 12 (Fault Code 343)
Blog.Teknisi
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