DESCRIPTIONThe ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B, +B2 (BATT) terminals to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit. When the VC circuit has a short circuit, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start. WIRING DIAGRAMCAUTION / NOTICE / HINTNOTICE: Check the fuses for circuits related to this system before performing the following inspection procedure. PROCEDURE
(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 and ECT" item of the Data List.
(a) Turn the ignition switch to ON. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
HINT:
(a) Disconnect the throttle body assembly connector. (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 and ECT" item of the Data List.
HINT: Perform "Inspection After Repair" after replacing the throttle body assembly.
(a) Disconnect the cam position sensor (for intake camshaft) connector. (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 and ECT" item of the Data List.
(a) Disconnect the cam position sensor (for exhaust camshaft) connector. (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 and ECT" item of the Data List.
(a) Disconnect the VALVEMATIC shaft sensor (cam position sensor) connector. (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 and ECT" item of the Data List.
(a) Disconnect the manifold absolute pressure sensor connector. (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 and ECT" item of the Data List.
(a) Disconnect the accelerator pedal sensor assembly connector. (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 and ECT" item of the Data List.
(a) Disconnect the canister pump module connector. (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 and ECT" item of the Data List.
(a) Disconnect the mass air flow meter sub-assembly connector. (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 and ECT" item of the Data List.
HINT: Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
(a) Disconnect the oil pressure sensor connector. (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 and ECT" item of the Data List.
(a) Disconnect the neutral position switch connector. (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 and ECT" item of the Data List.
(a) Disconnect the throttle body assembly connector. (b) Disconnect the cam position sensor (for intake camshaft) connector. (c) Disconnect the cam position sensor (for exhaust camshaft) connector. (d) Disconnect the manifold absolute pressure sensor connector. (e) Disconnect the accelerator pedal sensor assembly connector. (f) Disconnect the mass air flow meter sub-assembly connector. (g) Disconnect the neutral position switch connector. (for Manual Transaxle models) (h) Disconnect the oil pressure sensor connector. (for CVT models) (i) Disconnect the canister pump module connector. (j) Disconnect the VALVEMATIC shaft sensor (cam position sensor) connector. (k) Disconnect the ECM connectors. (l) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(m) Disconnect the No. 1 integration relay connector. HINT: Disconnect the No. 1 integration relay (EFI-MAIN relay) connected between the checked terminals as the coil inside the relay influences the measurement value. (n) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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