DESCRIPTIONWhen the engine switch is turned on (IG), the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the No. 1 integration relay (EFI-MAIN relay), closing the contacts of the EFI-MAIN relay and supplying power to terminals +B and +B2 of the ECM. WIRING DIAGRAMCAUTION / NOTICE / HINTNOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Disconnect the No. 1 integration relay connector. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Inspect the No. 1 integration relay (EFI-MAIN relay, IG2 NO. 1 relay).
(a) Disconnect the No. 1 integration relay connector. (b) Disconnect the ECM connector. (c) Remove the EFI-MAIN NO. 2 relay and EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly. HINT: Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value. (d) Remove the VVT relay from No. 2 relay block assembly. HINT: Remove the VVT relay connected between the checked terminals as the coil inside the relay influences the measurement value. (e) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT: If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.
(a) Disconnect the ECM connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Disconnect the No. 1 integration relay connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Disconnect the ECM connector. (b) Turn the engine switch on (IG). (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Disconnect the certification ECU (smart key ECU assembly) connector. (b) Disconnect the No. 1 integration relay connector. (c) Disconnect the instrument panel junction block assembly 4F connector. HINT: Disconnect the IG1-NO. 1, IG1-NO. 2 and IG2-NO. 2 relays connected between the checked terminals as the coil inside the relay influences the measurement value. (d) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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