GENERAL DESCRIPTION
This system is provided with four ignition coils with built-in ignition power transistors for each of the cylinders.
Interruption of the primary current flowing in the primary side of ignition coil generates a high voltage in the secondary side of ignition coil.
The powertrain control module (PCM) controls the four ignition power transistors to turn them alternately ON and OFF. This causes the primary currents in the ignition coils to be alternatively interrupted and allowed to flow to fire the cylinders in the order 1-3-4-2.
The PCM determines which ignition coil should be controlled by means of the signals from the camshaft position sensor which is incorporated in the camshaft and from the crankshaft position sensor which is incorporated in the crankshaft.
It also detects the crankshaft position to provide ignition at the most appropriate timing in response to the engine operation conditions.
When the engine is cold or operated at high altitudes, the ignition timing is slightly advanced to provide optimum performance.
Scheme 1
Scheme 2
KNOCK CONTROL SYSTEM CHECK
Check the knock sensor circuit if diagnostic trouble code, No. P0325 is shown.
Refer to Diagnostic Trouble Code Procedures - DTC P0325: Knock Sensor Circuit under MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS .
IGNITION COIL CHECK
Check by the following procedure, and replace the coil if there is a malfunction.
Scheme 3
Note. An analog-type ohmmeter should be used.
Note. Connect the negative probe of the ohmmeter to terminal 1.
| CAUTION | This test must be performed quickly (in less than 10 seconds) to prevent coil from burning and ignition power transistor from breaking. |
Scheme 4
- Connect and disconnect 4.5 - 9.0 V battery between terminal No. 2 and 3, and observe the ohmmeter whether there is continuity or not.
- If results do not agree with the table below, replace the primary coil and ignition power transistor assembly.
SECONDARY COIL CHECK
Note. It is impossible to check the secondary coil through the continuity check as a diode is integrated in the secondary coil circuit of this ignition coil. Accordingly, check the secondary coil in the following procedure.
- Disconnect the ignition coil connector.
- Remove the ignition coil and install a new spark plug to the ignition coil.
- Connect the ignition coil connector.
- Ground the side electrode of the spark plug and crank the engine.
- Check that spark is produced between the electrodes of the spark plug.
- If no spark is produced, replace the ignition coil with a new one and recheck.
- If spark is produced with the new ignition coil, replace the old one as it is faulty. If no spark is produced again, the ignition circuit is suspected as faulty. Check the ignition circuit.
Scheme 5
Scheme 6
- Remove the spark plug and connect to the ignition coil.
- Ground the spark plug outer electrode (body), and crank the engine. Check that there is an electrical discharge between the electrodes at this time.
SPARK PLUG CHECK AND CLEANING
| CAUTION | Do not attempt to adjust the gap of the iridium plug. Cleaning of the iridium plug may result in damage to the iridium tips. Therefore, if carbon deposits must be removed, use a plug cleaner and complete cleaning within 20 seconds to protect the electrode. Do not use a wire brush. |
Check the plug gap and replace if the limit is exceeded.
Standard value: 0.7 - 0.8 mm (0.028 - 0.031 inch)
Limit: 1.2 mm (0.047 inch)
Scheme 7
CAMSHAFT POSITION SENSOR CHECK
Refer to Diagnostic Trouble Code Procedures - DTC P0340 : Crankshaft Position Sensor Circuit under MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS .
CRANKSHAFT POSITION SENSOR CHECK
Refer to Diagnostic Trouble Code Procedures - DTC P0335: Crankshaft Position Sensor Circuit under MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS .
Scheme 8
Scheme 9
Scheme 10
Scheme 11
Required Special Tool
MD998773: Knock Sensor Wrench
<< A >> KNOCK SENSOR REMOVAL
Use special tool MD998773 to remove the knock sensor.
Scheme 12
>> A << KNOCK SENSOR INSTALLATION
Use special tool MD998773 to install the knock sensor.
FASTENER TIGHTENING SPECIFICATIONS
| ITEM | SPECIFICATION |
|---|---|
| Charging system | |
| Connector bracket bolt | 11 ± 1 N.m (98 ± 8 in-lb) |
| Generator bolt | 49 ± 9 N.m (36 ± 7 ft-lb) |
| Generator mounting bracket bolt | 49 ± 9 N.m (36 ± 7 ft-lb) |
| Generator nut | 44 ± 10 N.m (33 ± 7 ft-lb) |
| Generator terminal nut | 14 ± 3 N.m (124 ± 26 in-lb) |
| Harness bracket bolt | 11 ± 1 N.m (98 ± 8 in-lb) |
| Starting system | |
| Starter bolt | 30 ± 3 N.m (23 ± 2 ft-lb) |
| Starter cover bolt | 9.0 ± 2.0 N.m (80 ± 17 in-lb) |
| Starter cover bracket bolt | 49 ± 9 N.m (36 ± 7 ft-lb) |
| Starter terminal nut | 12 ± 2 N.m (102 ± 22 in-lb) |
| Ignition system | |
| Camshaft position sensor bolt | 11 ± 1 N.m (98 ± 8 in-lb) |
| Crankshaft position sensor bolt | 8.5 ± 0.5 N.m (76 ± 4 in-lb) |
| Ignition coil bolt | 10 ± 2 N.m (89 ± 17 in-lb) |
| Intake manifold stay bolt | 31 ± 3 N.m (23 ± 2 ft-lb) |
| Knock sensor | 23 ± 2 N.m (17 ± 1 ft-lb) |
| Knock sensor bracket bolt | 11 ± 1 N.m (98 ± 8 in-lb) |
| Spark plug | 25 ± 5 N.m (19 ± 3 ft-lb) |
Identifying Fastener Tightening Specifications
GENERAL SPECIFICATIONS
| ITEMS | SPECIFICATIONS |
|---|---|
| Generator | |
| Type | Positive battery positive voltage sensing |
| Identification number | A3TG1192 |
| Part No. | MN183450 |
| Rated output V/A | 12/110 |
| Voltage regulator | Electronic built-in type |
| Starter motor | |
| Type | Reduction drive with planetary gear |
| Identification number | M0T20671 |
| Part No. | MN153444 |
Identifying General Specifications (1 Of 2)
| ITEMS | SPECIFICATIONS |
|---|---|
| Rated output kW/V | 1.4/12 |
| No. of pinion teeth | 8 |
| Ignition coil | |
| Type | Molded 4 coil |
| Spark plugs | |
| NGK | LZFR6AI |
Identifying General Specifications (2 Of 2)
Scheme 13
See also:
• MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS