Ignition System Testing

Ignition Systems Fault tracing, EZ-115K

J10
Check temperature sensor

Measure resistance between connector terminal 2 (grey) and ground.
Instrument reading should agree with adjoining chart.

Chart:

If value is incorrect:
Measure sensor resistance directly to determine whether sensor or lead is faulty.
Replace sensor or lead as appropriate.





J11
Check leads to knock sensors

Undo connector at fuel distribution pipe, and bridge terminals 1 and 2.
Measure resistance between terminals 12 (black) and 13 (grey), and between terminals 24 (brown) and 25 (green) in control unit connector.
Resistance should be 0 ohm in both cases.
If resistance is too high ( infinity ), one (or both) of the leads is damaged (open-circuited). Remove jumper and measure each lead separately. Replace damaged lead(s).

If leads are intact but test diode displays fault code for Faulty knock sensor signal, replace sensor and repeat check with test diode. If fault persists, control unit is faulty.





J12
Check load signal from fuel system control unit

Measure voltage across connector terminal 8 (yellow) and ground.
Switch on ignition. Voltmeter should indicate approx. 11 Volts (depending on battery charge).

If voltmeter does not read or if reading is low:
Open-circuit in lead between control units or fault in fuel system control unit.





J13
Check No.1 cylinder detector

Measure resistance between connector terminals 18 (blue-yellow) and 19 (yellow-red).
Resistance should be 0 ohm.
Check that screen is connected to connector terminal 21 (black).