Lotus 2004 ELISE Service Notes page 150

Lotus Service Notes
Ignition System
P0351 Ignition Coil "A" Primary/Secondary Circuit
P0352 Ignition Coil "B" Primary/Secondary Circuit
P0353 Ignition Coil "C" Primary/Secondary Circuit
P0354 Ignition Coil "D" Primary/Secondary Circuit
Description
A Direct Ignition System (DIS) is used on the engine. The DIS improves the ignition accuracy, reduces high-
voltage loss, and enhances the reliability of the ignition system. The DIS is a 1-cylinder system that ignites one
cylinder with one ignition coil. The ECU determines the ignition timing and outputs the ignition signals (IGT) for
each cylinder. Based on IGT signals, the power transistors in the igniter cuts off the current to the primary coil,
which induces a spark at the spark plug connected to the secondary coil. The igniter will also send an ignition
confirmation signal (IGF) as a fail-safe measure to the ECU.
Component connections
Connector Pin
1
2
3
4
Malfunction Criteria
No IGF signal to ECM while engine is running
Potential failure modes:
• Open or short in IGF1 – IGF4 circuit from ignition coil to ECU
• Coil failure
Notes:
• The MIL will be illuminated if the fault is present for 2 consecutive trips.
• Further information on the sensor may be found inToyota 1ZZ-FE, 2ZZ-GE manual RM733E (B120T0327J)
pages DI-97 to DI-103
sn_emp_cyclone.indd 27
P0351
P0352
P0353
P0354
Description ECU Pin
Supply Voltage Coil 1
Ignition Coil Feedback 22 (F3) 22 (F3) 22 (F3) 22 (F3) 52 Way (Right)
Coil Output (Logic) 52 (G1) 26 (G4) 47 (G3) 48 (G2) 52 Way (Right)
Ground
'06 M.Y. in brackets
Coil 2 Coil 3 Coil 4
Section EMP
ECU Connector
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