DESCRIPTION When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI relay) and supplying power to terminals +B and +B2 of the ECM. WIRING DIAGRAM ![]() PROCEDURE
(a) Remove the IG2 MAIN fuse, EFI NO. 1 fuse and IGN fuse from the engine room relay block. (b) Remove the AM2 fuse from the driver side junction block. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
![]() (a) Remove the integration relay from the engine room relay block. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
![]() (a) Disconnect the ECM connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
![]() (a) Disconnect the ECM connectors. (b) Turn the ignition switch to ON. (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Disconnect the ECM connector. (b) Disconnect the ignition switch connector. (c) Disconnect the cable from the battery negative (-) terminal. (d) Disconnect the cable from the battery positive (+) terminal. (e) Remove the AM2 fuse and integration relay. (f) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Inspect the ignition switch (See page
(a) Disconnect the ECM connector. (b) Disconnect the cable from the battery negative (-) terminal. (c) Disconnect the cable from the battery positive (+) terminal. (d) Remove the integration relay from the engine room relay block. (e) Disconnect the integration relay connectors. (f) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Tundra Service Manual > Meter / Gauge System: Fuel Sender Open Detected (B1500)
DESCRIPTION This DTC is output when the combination meter detects the fuel sender gauge malfunction via the CAN. DTC Code DTC Detection Condition Trouble Area B1500 When combination meter detects fuel sender gauge malfunction Harness or connector Combination meter Fuel sender gauge Fuel suction with ...