Pinpoint Test CN: P0811, P1920
- NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.
Normal Operation and Fault Conditions
REFER to: Electric Powertrain Control - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition SOBDMC P0811:00 Excessive Clutch 'A' Slippage: No Sub Type Information This DTC sets when the engine speed measured by the PCM exceeds the engine speed measured at the transmission. SOBDMC P1920:62 Engine Speed Signal: Signal Compare Failure This DTC sets when the engine speed is higher than a calibrated range. Possible Causes
- Transmission damper
- Oil or Grease contamination inside the damper
- Transmission input shaft
- CKP sensor
- CMP sensor
- CN1 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using a diagnostic scan tool, check for CMDTC s.
Are any PCMCMDTC s related to the CKP or CMP sensors present?
Yes DIAGNOSE all PCMCMDTC s. Refer to the appropriate Engine article for the procedure. No GO to CN2 - CN2 REVIEW THE ENGINE AND GENERATOR RPM (REVOLUTIONS PER MINUTE) PARAMETER IDENTIFICATIONS (PIDS)
- Ignition ON.
- Connect the scan-tool.
Access the SOBDMC and monitor the G_SPEED (Rpm) PID
Access the SOBDMC and monitor the CTO (Rpm) PID
- With Transmission in Park - depress accelerator to WOT and engine will start.
- Utilizing scan tool record event so measurement can be made.
- Confirm both PID s move upon accelerator pedal is pressed.
Was the generator speed G_SPEED PID approximately 3.5 times that of the engine speed (CTO) PID '
Yes Attempt to duplicate the issue under high acceleration (max engine load) IN PARK while monitoring the PID s. The damper may slip under high loads due to oil/grease saturation. If slip of G_speed is more than approximately 3.5 times. REPLACE the damper and INSPECT the transmission input shaft or engine seals for leaks or damage and repair as needed. No For Engine RPMPID does not move and generator RPMPID does move, GO to CN3 - CN3 MONITIOR THE ENGINE RPM (REVOLUTIONS PER MINUTE) PID (PARAMETER IDENTIFICATION)
Access the SOBDMC and monitor the CTO (Rpm) PID- Start the engine.
- Open the hood
Is the engine spinning but the CTO PID reading zero?
Yes GO to CN5 No GO to CN4 - CN4 MONITIOR THE GENERATOR RPM (REVOLUTIONS PER MINUTE) PID (PARAMETER IDENTIFICATION)
Access the SOBDMC and monitor the G_SPEED (Rpm) PID- Listen for an audible noise from the vehicle.
Can you hear the generator spinning and verify the G_SPEED PID reads greater than zero?
Yes INSTALL a new transmission damper.VERIFY transmission input shaft spline integrity. No VERIFY the high voltage battery state of charge, recharge if necessary. REFER to: High Voltage Battery Charging - Full Hybrid Electric Vehicle (FHEV) . - CN5 CHECK THE CKP (CRANKSHAFT POSITION) SENSOR CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect CKP C101.
- Disconnect PCM C1381E.
- Measure and record:
Positive Lead Measurement / Action Negative Lead C101 Pin 1 C1381E Pin 11 C101 Pin 2 C1381E Pin 60 C101 Pin 3 C1381E Pin 59
Is the resistance below 5 ohms?
Yes GO to CN6 No With the aid of the wiring diagram, REPAIR the open circuit. - CN6 CHECK THE CKP (CRANKSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO GROUND
- Measure and record:
Positive Lead Measurement / Action Negative Lead C1381E Pin 11 Ground C1381E Pin 60 Ground C1381E Pin 59 Ground
Is the resistance above 10K ohms?
Yes GO to CN7 No With the aid of the wiring diagram, REPAIR the open circuit. - Measure and record:
- CN7 CHECK THE CKP (CRANKSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure and record:
Positive Lead Measurement / Action Negative Lead C1381E Pin 11 Ground C1381E Pin 60 Ground C1381E Pin 59 Ground
Is any voltage present?
Yes With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTC s and REPEAT the self-test. No GO to CN8 - CN8 CHECK THE CMP (CAMSHAFT POSITION) SENSOR CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect CMP C1366.
- Measure and record:
Positive Lead Measurement / Action Negative Lead C1366 Pin 3 C1381E Pin 17 C1366 Pin 1 C1381E Pin 45 C101 Pin 2 C1381E Pin 44
Is the resistance below 5 ohms?
Yes GO to CN9 No With the aid of the wiring diagram, REPAIR the open circuit. - CN9 CHECK THE CMP (CAMSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO GROUND
- Measure and record:
Positive Lead Measurement / Action Negative Lead C1366 Pin 3 Ground C1366 Pin 1 Ground C101 Pin 2 Ground
Is the resistance above 10K ohms?
Yes GO to CN10 No With the aid of the wiring diagram, REPAIR the open circuit. - Measure and record:
- CN10 CHECK THE CMP (CAMSHAFT POSITION) SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure and record:
Positive Lead Measurement / Action Negative Lead C1366 Pin 3 Ground C1366 Pin 1 Ground C101 Pin 2 Ground
Is any voltage present?
Yes With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTC s and REPEAT the self-test. No DIAGNOSE the engine speed reading zero when it's actually spinning. Refer to the appropriate Engine article for the procedure.