Description - engine management (ENGINE MANAGEMENT SYSTEM - V8) (page 32 of 43)

ENGINE MANAGEMENT SYSTEM - V8

DESCRIPTION AND OPERATION 18-2-37

There are eight IACV diagnostic checks performed by the ECM:

l

Output short circuit to earth – opening coil

l

Output short circuit to battery supply – opening coil

l

Output open circuit – opening coil

l

Output short circuit to earth – closing coil

l

Output short circuit to battery voltage – closing coil

l

Output open circuit – closing coil

l

Blocked IACV – rev/min error low (engine speed must be 100 rev/min less than the target speed, engine load 
less than 2.5 and the measured air flow more than 10 kg/h less than the expected air flow for a fault condition to 
be flagged).

l

Blocked IACV – rev/min error high (the engine speed must be more than 180 rev/min greater than the target 
speed and the measured air flow more than 10 kg/h greater than the expected air flow for a fault condition to be 
flagged).

Should a malfunction of the component occur, the following fault codes may be evident and can be retrieved by 
TestBook.

P Code

J2012 Description

Land Rover Description

P1510

IACV opening coil malfunction

Short circuit to battery supply - opening winding

P1513

IACV opening coil malfunction

Short circuit to earth - opening winding

P1514

IACV opening coil malfunction

Open circuit - opening winding

P1553

IACV closing coil malfunction

Short circuit to battery supply - closing winding

P1552

IACV closing coil malfunction

Short circuit to earth - closing winding

P1551

IACV closing coil malfunction

Open circuit - closing winding

P0505

Idle control system malfunction

Blocked IACV - high or low rev/min error