61
ENGINE MANAGEMENT MODULE (EMM)
INTERNAL EMM FUNCTIONS
4
INTERNAL EMM
FUNCTIONS
Start Assist Circuit (SAC)
When the ignition key is ON, the EMM Start Assist
Circuit (SAC) boosts battery voltage (12 V) to
30 V on the system (55 V) circuit.
If the SAC circuit current exceeds 2 Amps, or if the
SAC voltage is less than 20 V, the EMM:
ROM Verification
The EMM performs a self-test of programming
every time it is turned ON. Service code 15 indi-
cates a programming (software) issue. Repro-
gram the EMM with the correct software program
to correct the problem.
Idle Controller
The idle controller reacts to engine operating con-
ditions. Fuel and ignition timings are altered to
maintain a specific RPM when engine is cold or
warm. The controller is inactive when TPS is
advanced from idle position.
RPM Limiter
This feature of EMM programming prevents
engine damage due to excessive RPM. At 6250
RPM, fuel and ignition to the cylinders is shut off.
Normal operation resumes when engine RPM
returns to the specified range.
Neutral RPM Limiter
This feature prevents engine damage due to
excessive RPM if accelerated in NEUTRAL. Neu-
tral engine speed is limited to 1100 RPM.
Engine Monitor and Warning
Systems
Refer to ENGINE MONITOR SYSTEM on p. 62.
Refer to S.A.F.E. WARNING SYSTEM on p. 63.
Refer to SHUTDOWN MODE on p. 63.
Fault Code Creation and Storage
Refer to the EMM Service Code Chart at the
back of this manual for a complete list of all
engine fault codes.
Stores service code 77
EMM LED 1: ON (Running)
To Next Page
Loading...
