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DTC P0100 MASS AIR FLOW SENSOR (MAFS); Diagnostic Procedure (Cont'd); Steps 2-4

EF & EC-7079prose procedure

Source step 3 expected-voltage table reads 'Terminal 2: Approximately 5; Terminal 4: Battery voltage' while the prose line below says 'Battery voltage at terminal 2 and approximately 5V at terminal 4' — verbatim contradictory text in the source; both versions preserved.

Continued from EF & EC-7078

Diagnostic Procedure (Cont'd)

CG10, CGA3

Step 2 — RETIGHTEN GROUND SCREWS

  1. 1
    Turn ignition switch "OFF".
  2. 2
    Loosen and retighten body groun screws. (See NEF147A)
  3. 3
    → GO TO 3.

Step 3 — CHECK POWER SUPPLY

  1. 1
    Disconnect mass air flow sensor harness connector. (See NEF150A)
  2. 2
    Turn ignition switch "ON".
  3. 3
    Check voltage between terminals 2, 4 and ground with CONSULT-II or tester. (See SEF297X)
  4. 4
    Expected: - Terminal 2: Approximately 5 V - Terminal 4: Battery voltage - Voltage: Battery voltage at terminal 2 and approximately 5V at terminal 4.
  5. 5
    OK or NG: - OK → GO TO 5. - NG → GO TO 4.

Step 4 — DETECT MALFUNCTIONING PART

  1. 1
    Check the following: - Harness connectors F32, E67 - Harness for open and short between mass air flow sensor and ECM relay - Harness for open and short between mass air flow sensor and ECM
  2. 2
    → Repair harness or connectors.
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