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AUTOMATIC TRANSMISSION (AW30-40LE) 7A-37 DTC P0120 (FLASHING CODE 21) ANALOG THROTTLE SIGNAL FAILURE (VTH) (FOR UBS) Step Action Value(s) Yes No 1 1. With the engine “OFF”, turn the ignition “ON”. pin connector terminal (6) and ground Is the voltage within the specified valve? 0.25−0.45 V Go to Step 2 Go to Step 3 2 Open the throttle fully. 3.74−4.56 V The problem is intermittent. Refer to “Diagnostic aids”. Go to Step 3 3 Connect a voltmeter between the ECM 32 pin 0.25−0.45 V Go to Step 4 Go to Step 6 4 Open the throttle fully. 3.74−4.56 V Go to Step 5 Go to Step 6 5 1. Check the wiring harness between the TCM 28 pin connector terminal (6) and ECM 32 2. Or TCM is faulty. Was a problem found and corrected? − Go to Step 9 − 6 1. Disconnect the TPS 3 pin connecter. connector terminal (3) and (1). Is the voltage within the specified value? 4.75−5.25 V Go to Step 7 Go to Step 8 7 Check the TPS connector. If OK, replace the − Go to Step 9 − 8 Check the wiring harness between the TPS and − Go to Step 9 − 9 1. After the repair is complete, use the scan tool to select “DTC”, then “clear Info” function. 2. Make a road running test for the vehicle. Has the last test failed or is the current DTC − Begin the again. Go to Step 1 System OK |