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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on. Start engine and allow it to idle. Using scan tool, monitor MAF rate. If scan tool reading is 0.0 gm/sec., go to next step. If reading is 271.0 gm/sec. or more, go to step  5.
  2. Disconnect MAF sensor connector. Turn ignition on. Using DVOM, measure voltage between ground and terminal No. 1 (Black wire) at MAF sensor harness connector. See Fig 1. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, locate and repair open in White and Black wire between MAF sensor connector and EFI main relay. EFI main relay is located in engine compartment fuse/relay block on passenger's side firewall.
    Fig 1: Identifying Mass Airflow Sensor Connector Terminals
    G00165106Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Access ECM at left front of engine compartment. Start engine. Ensure transmission is in Park or Neutral and A/C is off. Backprobing connector, measure voltage between ground and terminal VG at ECM connector E4. See Fig 2 and Fig 4 . If voltage is .5-3.0 volts, replace ECM and retest. If voltage is not .5-3.0 volts, go to next step.
    Fig 2: Checking Voltage At Terminal VG Of ECM Connector E4
    G00165107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check for an open or short in Black/Red wire between MAF sensor and ECM E4 connector. Repair wiring harness as necessary. If wiring is okay, replace MAF sensor and retest.
  5. Turn ignition off. Backprobing connector, check for continuity between ground and terminal EVG at ECM connector E4. See Fig 3 and Fig 4 . If continuity does not exist, replace ECM and retest. If continuity exists, go to next step.
  6. Check for open in wiring between MAF sensor and ECM. Repair as necessary. If wire is okay, replace MAF sensor.
Fig 3: Checking Voltage At Terminal EVG Of ECM Connector E4
G00165108Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Identifying Engine Control Module (ECM) Connectors & Terminals
G00024256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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