Montero Sport ES 4WD V6-3.0L SOHC (2002)
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MB991502: Scan Tool (MUT-II)
STEP 1. Check the input signal from the driver's side door switch (by using scan tool MB991502).
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or
disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the driver's side door is opened.
Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters?
YES: Replace the ETACS-ECU. Check that the malfunctions eliminated.
NO: Go to Step 3.
STEP 2. Check the input signal from the driver's side door switch (by using a voltmeter).
Check the input signals from the following switches:
1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
Q: Does the voltmeter indicator deflect?
YES: Replace the ETACS-ECU. Check that the malfunctions eliminated.
NO: Go to Step 3.
