ENGINE TUNE-UP [ZY, Z6]

Engine Tune-up Preparation

1. Verify the following:

• ATX: Selector lever is in P position.

• MTX: Shift lever is in neutral position.

2. Warm up the engine to normal operating temperature.

(1) Increase the engine speed to 2,500-3,000 rpm until the cooling fan starts running.

(2) When the cooling fan starts running, release the accelerator pedal and wait until the cooling fan stops running.

3. Turn off all electrical loads.

4. Connect the WDS or equivalent to the DLC-2.

5. Turn the test mode on using a simulation function.

6. Verify that the idle speed is within the specification using the RPM DATA MONITOR function.

• If not within the specification, adjust the idle speed.

Idle speed

ZY

MTX: 600-700

ATX (N range): 600-700

ATX (D range): 525-625

Z6

MTX: 600-700

ATX (N range): 650-750

ATX (D range): 600-700

Ignition Timing Inspection

Note

• The ignition timing cannot be adjusted.

• The WDS or equivalent is required to verify the ignition timing.

• Use a timing light that can detect the primary ignition signal.

1. Complete the engine tune-up preparation.

2. Remove the PCM connector cover.

3. By referring to the following procedure, connect the timing light to the PCM terminal 2A wire.

Caution

• To prevent poor contact at the connector terminal, be careful not to pull the wire on the connector side.

Note

• Pull out the wire 20-30 mm so that the pickup clip of the timing light can be connected. After the ignition timing inspection, bundle the pulled out wire back together with other wires using tape.

(1) Pull the PCM terminal 2A wire out of the bundle (pull the bundled side only, not the connector side).

(2) Connect the pickup clip of the timing light to the PCM terminal 2A wire.

4. Verify that the crankshaft pulley alignment mark (white) is within the specification.

Ignition timing (Test mode on)

BTDC 9-11°

5. Turn the test mode off using a simulation test.

6. Using the timing light, verify again that the crankshaft pulley alignment mark (white) is within the specification.

• If not within the specification, inspect the following parts:

- CMP sensor

- CKP sensor

- TP sensor

- ECT sensor

- TR switch (ATX)

- Neutral/clutch switch (MTX)

Ignition timing (Test mode off)

BTDC 6-18°

Idle Speed Inspection

Caution

• Changing the TAS while attempting to adjust the idle speed could cause an engine malfunction. Do not change the TAS adjustment position.

1. Complete the engine tune-up preparation.

2. Verify that the ignition timing is within the specification. (See Ignition Timing Inspection.)

3. Verify that the idle speed is within the specification using the RPM DATA MONITOR function.

• If not within the specification, adjust the idle speed to within the specification by turning the AAS after verifying that the ignition timing is within the specification.

Idle speed

ZY

MTX:600-700

ATX (N range):600-700

ATX (D range):525-625

Z6

MTX:600-700

ATX (N range):650-750

ATX (D range):600-700

4. Verify that the idle speed is within the specification when each load is applied. (The speed decrease just after the load is applied is not considered.)

• If not within the specification with any of the specified loads applied, inspect the IAC valve.

• If not within the specification when a specified load is applied, inspect the related input parts, wiring harnesses, and connectors.

Standard

Load status		Idle speed (rpm) N, D position (ATX), Neutral position (MTX)
		ZY			Z6
		MTX	ATX		MTX	ATX
			N range	D range		N range	D range
No load		600-700		525-625	600-700	650-750	600-700
Electrical loads on*1	34-42 A	650-750	600-700		650-750		600-700
	Above 42 A	700-800
A/C on	Low load*2	650-750
	High load*3	700-800
P/S on		-			700-800

*¹ :

Generator generating current value

*² :

Refrigerant pressure switch (middle pressure switch) is off.

*³ :

Refrigerant pressure switch (middle pressure switch) is on.

Idle Mixture Inspection

1. Warm up the engine to normal operating temperature.

(1) Increase the engine speed to 2,500-3,000 rpm until the cooling fan starts running.

(2) When the cooling fan starts running, release the accelerator pedal and wait until the cooling fan stops running.

2. Verify that the idle speed and ignition timing are within the specification. (See Idle Speed Inspection.) (See Ignition Timing Inspection.)

3. Insert an exhaust gas analyzer into the tailpipe.

4. Verify that the CO and HC concentrations are within the regulation.