Montero XLS 4WD V6-3.5L SOHC (2001)
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MB991223: Test Harness Set
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MB991502: Scan Tool (MUT-II)
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MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the trouble symptom
Q: Is the encrypted code register mode set?
YES: Go to Step 4.
NO: Go to Step 2 <when using scan tool MB991502> or 3 <when using a volt meter>.
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signals from the following switches:
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Key reminder switch
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Hazard warning light switch
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 input signal enters.
Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters?
YES: Replace the ETACS-ECU. Check that the transmitter can be registered.
NO: Check the relevant input circuit.
STEP 3. Check the input signal (by using a voltmeter).
Check the input signals from the following switches:
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Key reminder switch
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Hazard warning light switch
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 transmitter can be registered.
NO: Check the relevant input circuit.
