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fuel pump circuit should be verified. A fuel pump module, which is controlled by the ECM supplies the fuel pump. In all cases of suspected PATS non-start issues, the most logical failure modes should be eliminated first. Check all relevant supplies and grounds to the IC and ECM, check that the starter relay has a permanent 12v supply, check that the relay has a 12v supply and ground across the coil whilst the ignition is in the crank position. PATS Fault Codes For the various PATS modes/faults listed in the table , the IC will store a DTC and indicate this to the customer during the detection peroid defined in the 'when logged' column, by illuminating the indicator as described for 60 seconds and then flashing the LED 10 times as appropriate. The indication will stop immediately the ignition is turned to off any time during the fault indication sequence. Up to 4 DTC's could be stored per key read (1-!0 read attempts). No DTC's will be stored until all retry attempts are complete. Only the highest priority fault code will be flashed.
The PATS LED will be commanded on as shown under 'indication'. Normal PATS operations are complete within 400ms of the ignition switch transition from off to run or start, worst case for ECM communication problems will be less than 2 seconds. If PATS is not complete during the 2 seconds the ECM will terminate PATS and await the next ignition run/start event. PATS faults will be indicated via the LED as soon as possible and will terminate the LED prove out. At key off all previous flashing will cease and the perimeter anti theft system will control the LED when the vehicle is locked and armed. Mode of Operation/Fault
When Logged
Ignition Switch Position
DTC
LED Fault Code
Indication
Prove out
N/A
Off to Run/Start
N/A
N/A
3 Seconds of steady illumination
Perimeter Anti theft Control
N/A
Off
N/A
N/A
Off or 0.5Hz, 5% duty cycle until off
Transceiver not connected
Key Read
Run/Start
B1681
11
60 seconds off 4Hz flashing at 50% duty cyle followed by fault code flashing 10 times Key problem. No code received from Key
Key Read
Run/Start
B1600
13
60 seconds off 4Hz flashing at 50% duty cyle followed by fault code flashing 10 times Key/Transceiver problem, partial code received, Key Read
Run/Start
B1602
14
60 seconds off 4Hz flashing at 50% duty cyle followed by fault |