5. Diagnosis
W
hile
the ITMCM
is actived it periodically monitors its inputs and outputs. If a
fault is detected the Diagnostic Bulb is illuminated and flash at a
rate of 0.25 seconds “ON”, and 0.25 seconds “OFF”. A fault
code will also be stored in the ECU memory.
The first time a fault is detected a DTC is stored in the ECU’s Non-Volatile memory. This DTC will remain in memory until the ITMCM is instructed to erase DTC's by the diagnostic tester. DTC's will not be erased by disconnecting power to the ITMCM.
DTCs |
ITMES |
DESCRIPTION |
P1717 |
Steer 1 |
Loss of signal out of range |
P1718 |
Steer 2 |
Loss of signal out of range |
P1719 |
Steer C |
Loss of signal out of range |
P1726 |
TPS input-loss of signal |
Loss of signal out of range |
P1728 |
EMC-open/short to battery |
Short/Open to battery |
P1729 |
EMC-short to ground |
Short to ground |
P1750 |
FLSS loss of signal |
Malfunction of front & left speed sensor |
P1751 |
FRSS loss of signal |
Malfunction of front & right speed sensor |
P1752 |
RLSS loss of signal |
Malfunction of rear & left speed sensor |
P1753 |
RRSS loss of signal |
Malfunction of rear & right speed sensor |
P1764 |
ECM-ITM CAN line, or ECM side malfunction |
Malfunction of ECM-ITMCM CAN line |
P1765 |
TCS-ITM CAN line, or ECM side malfunction |
Malfunction of TCSCM-ITMCM CAN line |
Input |
Error Description |
Diagnostic |
Diagnostic Lamp |
Clearing Strategy |
TPS |
Loss of signal Out of range |
P1726 |
Blinking |
Active P-code cleared error is removed after 1 second |
Error Strategy |
A fault code from the CAN Bus, Signal lost for 1 sec. Fault code stored in memory |
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ECU Action |
TPS=0, The ITMCM will not send current to the clutch coil. |
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Steer_1 |
Loss of signal Out of range |
P1717 |
Blinking |
Active P-code cleared if error is removed after 1 second |
Steer_2 |
Loss of signal Out of range |
P1718 |
Blinking |
Active P-code cleared if error is removed after 1 second |
Steer-C |
Loss of signal Out of range |
P1719 |
Blinking |
Active P-code cleared if error is removed after 1 second |
Error Strategy |
Out of Range Signal : Voltage >= 4.5 vdc for greater than 1 second |
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ECU Action |
Steering Wheel Sensor input=0. The ITMCM will not send current to the clutch coil. |
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FLSS |
Loss of signal |
P1750 (C1201) |
Blinking |
Fault cleared at ignition cycle reset. P-code stored, and erased by K-Line tool |
FRSS |
P1751 (C1201) |
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RLSS |
P1752 (C1201) |
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RRSS |
P1753 (C1201) |
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Error Strategy |
Measure individual wheel, if speed difference is 30kph for 30 seconds fault code will be set. Ignition cycle reset |
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ECU Action |
Speed sensor error will turn ITM off. ITM will not have output |
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Input |
Error Description |
DTC |
Diagnostic Lamp |
Clearing Strategy |
C.A.N |
ECM-ITMCM Communication Line, or ECM side malfunction |
P1764 |
Blinking |
Active P-code cleared if error is removed |
Error Strategy |
Loss of the following signals TPS, Transmission type. |
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ECU Action |
The ITMCM will not send current to the clutch coil. |
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C.A.N |
TCSCM-ITMCM CAN Line, or ECM side malfunction |
P1765 |
Blinking |
Active P-code cleared if error is removed |
Error Strategy |
Loss of the following signals Wheel Speed No signal for greater than 1 second, and a fault will be set. |
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ECU Action |
Speed sensor error will turn ITM off. ITM will not have output |
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EMC |
Short/Open to Battery |
P1728 |
Blinking |
Same as Speed sensor fault |
Short to Grid |
P1729 |
Blinking |
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Error Strategy |
25 occurrences in a row mature |
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ECU action |
EMC Error will turn ITM off. The ITMCM will not send current to the clutch coil |
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