FUEL ADDITIVE CONTROL MODULE INSPECTION [MZ-CD 1.6 (Y6)]

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Not Using the M-MDS

Note

•  The fuel additive control module terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the fuel additive control module is necessary to determine where the malfunction occurs.

Fuel additive control module terminal voltage table (Reference)

Terminal	Signal name	Connected to	Measurement condition	Voltage (V)	Inspection item(s)
1	Power supply	Battery	Under any condition	B+	•  Related wiring harness
2	—	—	—	—	—
3	IG1 signal	Engine switch	KOEO/KOER	B+	•  Engine switch •  Related wiring harness
4	—	—	—	—	—
5	—	—	—	—	—
6	Controller area network (low)	Controller area network (low)	Because this terminal is for CAN, determination by terminal voltage is not possible		•  Related wiring harness
7	Controller area network (high)	Controller area network (high)	Because this terminal is for CAN, determination by terminal voltage is not possible		•  Related wiring harness
8	Ground	Body Ground	Under any condition	1.0 or less	•  Related wiring harness
9	Fuel additive pump control signal	Fuel additive pump unit	For several tens of seconds approx. 4 min after fueling and turning engine switch to ON position	B+	•  Fuel additive pump unit •  Related wiring harness
10	Ground for fuel additive level sensor and fuel additive pump unit	Fuel additive level sensor	Under any condition	1.0 or less	•  Fuel additive level sensor •  Fuel additive pump unit •  Related wiring harness
11	Fuel additive level sensor reference signal	Fuel additive level sensor	—	—	•  Fuel additive level sensor •  Related wiring harness
12	—	—	—	—	—
13	Fuel additive level sensor signal	Fuel additive level sensor	—	—	•  Fuel additive level sensor •  Related wiring harness
14	—	—	—	—	—
15	Fuel-filler switch (–) signal	Fuel-filler switch	Under any condition	1.0 or less	•  Fuel-filler switch •  Related wiring harness
16	Fuel-filler switch (+) signal	Fuel-filler switch	Fuel-filler lid is open	B+	•  Fuel-filler switch •  Related wiring harness
			Fuel-filler lid is closed	1.0 or less

Using the M-MDS (reference)

1.  Connect the M-MDS to the DLC-2.

2.  Turn the engine switch to the ON position.

3.  Measure the PID value.

•  If the PID value is not within the specification, follow the instructions in the Action column.

Note

•  The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the Fuel additive control module. Therefore, an output device malfunction is not directly indicated as a malfunction of the monitored value for the output device. If a monitored value of an output device is out of specification, inspect the monitored value of the input device related to the output control.

•  The simulation items that are used in the ENGINE CONTROL SYSTEM OPERATION INSPECTION are as follows.

―  ADD_PUMP, GAUGING

PID monitor table