Achieva L4-144 2.4L DOHC VIN T SFI (1996)
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Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for the following items:
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Backed out terminals
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Improper mating
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Broken locks
Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on
the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored on the scan
tool for later reference.
4. The coolant level switch cannot be removed from the surge tank. Draining the coolant from the tank will check if the switch can detect an empty
tank and also check the PCM and wiring.
6. A test light is used to determine if the coolant level telltale lamp is remaining ON because of a shorted signal circuit, a faulty PCM, or a faulty
IPC. If the test light is ON, then the signal circuit is shorted to ground.
7. This simulates a normal coolant level. If the telltale lamp turns OFF when the coolant level switch is disconnected, then the PCM, the IPC and the
wiring are OK.
9. The PCM uses a voltage signal to sense when the coolant signal circuit is pulled low by the coolant switch. If voltage is not present on this the
signal circuit, then the circuit is open, or connections or the PCM are faulty.
12. This will determine that the battery voltage seen on the signal circuit was from the PCM and not a wire shorted to voltage.
15. The PCM sends coolant level information through serial data to the IPC. If the scan tool indicates a low coolant level when the coolant level
switch electrical connector disconnected, then the PCM is faulty.
19. Replacement PCM's must be reprogrammed. Refer to the latest Techline information for programming procedures.
20. If no faults have been found at this point and no additional DTC's were set, refer to Diagnostic Aids for additional checks and information.
