Intermittent Fault, Signal Too Low

Intermittent fault, signal too low

Checking cables
Check engine control module (ECM) and mass air flow (MAF) sensor connectors for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Check for damaged or loose pins.
Check signal cable between engine control module (ECM) terminal 16 and mass air flow (MAF) sensor terminal 2 for an intermittent short-circuit to ground and remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Check power cable between mass air flow (MAF) sensor terminal 3 and system relay (2/14) terminal terminal 3 for an intermittent open-circuit and remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
The supply voltage should be approximately battery voltage when the system relay is activated.
If no faults are found in the above fault-tracing try a new mass air flow (MAF) sensor.

Other information
- To connect the test box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000.
- To replace the mass air flow (MAF) sensor, see Replacing the mass air flow (MAF) sensor .













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