INTRODUCTION
Note. Introduction information not applicable.
ENGINE MECHANICAL
Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.
VALVE CLEARANCE
Note. Hydraulic lifters are used. No adjustments are required.
IGNITION TIMING
Ignition timing is controlled by Digital Motor Electronics (DME) engine management system and is not adjustable. Specifications given in the IGNITION TIMING is for verification purpose only. (Scheme 1)
| Application | Degrees @ RPM |
|---|---|
| Automatic Transmission | TDC +/- 3 @ 710-790 |
| Manual Transmission | TDC +/- 3 @ 760-840 |
IGNITION TIMING
Scheme 1
COLD (FAST) IDLE
Fast idle speed is controlled by Digital Motor Electronics (DME) engine management system and is not adjustable.
IDLE SPEED & MIXTURE
Note. After disconnecting battery or DME control unit, the engine MUST be run at idle for at least 10 minutes before idle speed and CO level can be rechecked.
Idle speed and mixture are controlled by Digital Motor Electronics (DME) engine management system and are not adjustable. Values given in IDLE SPEED & CO LEVEL are for verification purpose only.
| Application | (1) Idle RPM | (2) CO Level |
|---|---|---|
| Automatic Transmission | 710-790 | 0.4-1.2 % |
| Manual Transmission | 760-840 | 0.4-1.2 % |
| (1) Idle RPM is controlled by DME and is not adjustable. (2) With oxygen sensor connected. Measurement is taken in front of catalytic converter. Hydrocarbon level should be equal to or less than 300 parts per million (ppm). | ||
| (1) | Idle RPM is controlled by DME and is not adjustable. |
| (2) | With oxygen sensor connected. Measurement is taken in front of catalytic converter. Hydrocarbon level should be equal to or less than 300 parts per million (ppm). |
IDLE SPEED & CO LEVEL
CLOSED THROTTLE POSITION (CTP) SWITCH
- Disconnect CTP switch. (Scheme 2) Using an ohmmeter, check continuity between switch terminals No. 1 and 2. (Scheme 3)
- With throttle valve closed, ohmmeter reading should be less than 10 ohms. Open throttle valve beyond one-degree angle. With throttle valve open, ohmmeter reading should be infinite.
- If ohmmeter readings are not as specified, use a 0.036" (0.90 mm) feeler gauge to adjust clearance between switch housing and drag lever when throttle valve is closed.
Scheme 2
Scheme 3
Manual Transmission Only
- Disconnect wide open (full) throttle switch. (Scheme 2) Using an ohmmeter, check continuity between switch terminals No. 2 and 3. (Scheme 3)
- With throttle valve closed, ohmmeter reading should be infinite. With throttle valve at least 2/3 open, resistance should be less than 10 ohms. If ohmmeter readings are not as specified, adjust switch so contacts will close at throttle angle of about 70 degrees.
| Application | Ohms | |
|---|---|---|
| Closed Throttle Position (CTP) Switch (1) | ||
| Throttle Valve Closed | Less Than 10 | |
| Throttle Valve Open (2) | Infinite | |
| Throttle Valve Potentiometer (3) | ||
| Throttle Valve Closed (Idle) | 0.5 | |
| Throttle Valve Open (Full Throttle) | 4000 | |
| Wide Open (Full) Throttle Switch (4) | ||
| Throttle Valve Closed | Infinite | |
| Throttle Valve Open (5) | Less Than 10 | |
| (1) Measure between terminals No. 1 and 2. (Scheme 3) (2) Throttle valve angle opening is greater than one degree. (3) Check potentiometer resistance between terminal No. 2 (Green/Yellow wire) and terminal No. 3 (Brown wire). (4) Measure between terminals No. 2 and 3. (Scheme 3) (5) Throttle valve must be at least 2/3 open. | ||
| (1) | Measure between terminals No. 1 and 2. (Scheme 3) |
| (2) | Throttle valve angle opening is greater than one degree. |
| (3) | Check potentiometer resistance between terminal No. 2 (Green/Yellow wire) and terminal No. 3 (Brown wire). |
| (4) | Measure between terminals No. 2 and 3. (Scheme 3) |
| (5) | Throttle valve must be at least 2/3 open. |
THROTTLE VALVE SWITCH RESISTANCE
Tiptronic (Automatic Transmission Only)
- Adjust throttle valve potentiometer, also known as Throttle Position (TP) sensor, so that click is heard when small diameter throttle valve plate begins to open. DO NOT confuse throttle valve potentiometer adjustment click with click produced by Closed Throttle Position (CTP) switch contacts.
- With ignition off, disconnect throttle valve potentiometer. Check potentiometer resistance between terminal No. 2 (Green/Yellow wire) and terminal No. 3 (Brown wire). Resistance should vary from 0.5 ohms at idle to 4000 ohms at full throttle. If resistance is not as specified, replace throttle valve potentiometer.
Poses Online
See also:
• IGNITION TIMING