Preparation For Test - Section 22

Preliminary work:
Diagnosis - malfunction memory, see section 11. System Specific Notes

WARNING: Risk of severe injury when touching ignition parts which produce high voltages. Do not touch ignition components. Persons with heart pacemakers are not to perform repairs on this type of ignition system.

1. Review sections: 11, 21, 22, 23, 24, 31, 33.
2. Review section 0, Connection and Use of Test Equipment - Section 0
3. Connect HHT and readout DTC memory.
4. Ignition: OFF
5. Connect test cable with socket box as per "Connection Diagram - Socket Box", see Figure 1 below.

IMPORTANT: Connector with red marking is not required at this time since the engine control module has presently no function installed for it. When disconnecting the connectors on the engine control module remove center connector (D) first, when reconnecting connectors install center connector (D) last.

NOTE: The test program is divided into four sections:
23 SFI Test (Sequential Multiport Fuel Injection System)
24 Ignition System Test
25 EA System Test (Electronic Accelerator)
25 CC System Test (Cruise Control)

Note regarding "Test Connection" column:
The numbers indicated in parentheses, for example, => 1.0 (2A) signify:
2 = Socket 2 on wiring diagram.
A = Connector A on wiring diagram,

Special Tools:

Test equipment:
Description Brand, model, etc.
Digital multimeter Fluke models 23, 77 III, 83, 85, 87
Engine analyzer Bear DACE
Hermann Electronic







WARNING: Risk of severe injury due to high voltage ignition components.
Persons with heart pacemakers are not to perform repairs on
this type of ignition system.

Electronic ignition systems produce dangerous high voltages on both the primary circuit and the secondary (ignition) circuits. Due to the high voltages produced, contact with any of the voltage carrying components can be dangerous to your health (burns, heart palpitations, cardiac arrest etc.).
- Persons with heart pacemakers are not to perform repairs on this type of ignition system.
- Ignition must be turned OFF prior to performing any repair work on the ignition system.
- Do not come in contact or remove with any of the ignition components while the engine is cranking or idling.
- Wear rubber soled shoes.
- Disconnect connectors for CKP sensor at sensor or control module.
- If repairs require that the ignition be turned on, then dangerous voltages will be present through out the entire ignition system.
- No exposed metal connectors or sending units may be installed in the ignition wires.

To Avoid Damage to the Ignition System
- To avoid damage to the engine control module, connect/disconnect the control module connectors only with the ignition: OFF
- Circuit 1 of the ignition coil may not be shorted to ground, e.g. theft deterence.
- Only original equipment should be installed in the ignition system.
- Do not operate the ignition system at cranking speed unless the entire ignition harness is connected.
- Do not perform any tests (grounding of ignition cable 4 disconnecting a spark plug connector or pulling cable 4 out of the ignition coil) at cranking or idle speed.
- The high output side of the ignition system must carry at least 2 K Ohms of load (spark plug connector).
- If assisting a disabled vehicle and it becomes necessary to perform an ignition spark test, perform this test only on one ignition/spark plug. Ensure a good ground connection to the spark plug.
- ME - SFI: the ignition system is to be turned OFF, when cranking engine to perform compression tests, additionally, it is necessary to disconnect connector 2 from the control module.

Using Test Equipment
- Ensure that the engine and ignition are OFF when connecting/ disconnecting test equipment to a coil.
- Connect the secondary voltage measuring equipment on the corresponding secondary ignition lead only when engine is stopped and ignition is OFF.
- If the circuit breaker is activated (power balance test), and the engine stalls, then the test procedure with this tester cannot be performed.
- Do not connect a test lamp to circuit 1 or 15 of the ignition coil.

Figure 1 - Connection Diagram - Socket Box:

NOTE: When disconnecting the connectors on the engine control module remove center connector (D) first, when reconnecting connectors install center connector (D) last.

IMPORTANT: Connector with red marking is not required at this time since the engine control module has presently no function installed for it.

Figure 2 - Connector Layout - ECM Pins (1A-27C):

Figure 3 - Connector Layout - ECM Pins (28C-40C, 1D-24D):

Figure 4 - Connector Layout - ECM Pins (1E-35E):

Figure 5 - Connector Layout - ECM Pins (37E-48E, 1F-21F):