DESCRIPTIONThe ECM constantly uses 5 V from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit. When the VC circuit is shorted, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions. HINT: Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned ON. The MIL goes off when the engine is started. WIRING DIAGRAMCAUTION / NOTICE / HINTNOTICE: Check the fuses for circuits related to this system before performing the following inspection procedure. PROCEDURE
(a) Check that the Malfunction Indicator Lamp (MIL) illuminates when turning the ignition switch to ON.
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Check the communication between the Techstream and ECM. HINT: It can be checked using the "Engine" item of the Data List.
(a) Disconnect the B20 throttle body with motor assembly connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
HINT: Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
(a) Disconnect the A57 accelerator pedal sensor assembly connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the u1 crankshaft position sensor connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the B16 VVT sensor (for intake camshaft of bank 1) connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the B17 VVT sensor (for intake camshaft of bank 2) connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the BB37 VVT sensor (for exhaust camshaft of bank 1) connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the B36 VVT sensor (for exhaust camshaft of bank 2) connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the B64 fuel pressure sensor (for high pressure side) connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
HINT: Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).
(a) Disconnect the B59 fuel pressure sensor (for low pressure side) connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
HINT: Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).
(a) Disconnect the B56 mass air flow meter connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the g1 canister pump module connector. (b) Turn the ignition switch to ON. (c) Check the MIL.
(a) Disconnect the D20 throttle body with motor assembly connector. (b) Disconnect the A57 accelerator pedal sensor assembly connector. (c) Disconnect the u1 crankshaft position sensor connector. (d) Disconnect the B16 VVT sensor (for intake camshaft of bank 1) connector. (e) Disconnect the B17 VVT sensor (for intake camshaft of bank 2) connector. (f) Disconnect the B37 VVT sensor (for exhaust camshaft of bank 1) connector. (g) Disconnect the B36 VVT sensor (for exhaust camshaft of bank 2) connector. (h) Disconnect the B64 fuel pressure sensor (for high pressure side) connector. (i) Disconnect the B59 fuel pressure sensor (for low pressure side) connector. (j) Disconnect the B56 mass air flow meter connector. (k) Disconnect the A69 and B67 ECM connectors. (l) Disconnect the g1 canister pump module connector. (m) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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