Name of code: P0218(75) - High Temperature
Operation Activated.
NOTE: This DTC is an informational DTC
designed to aid the technician in diagnosing
shift quality concerns.
When monitored: Whenever the engine is run-
ning.
Set condition: Immediately once the Overheat
Shift Schedule is activated.
Theory of operation: If the transmission oil
temperature rises above 115°C (240°F), the over-
heat shift schedule is activated refer to Transmis-
sion Operation as a function of Transmission Oil
Temperature and the code is set. The DTC is an
information code only and is being set to aid the
technician in determining root cause of a customer
driveability issue. The code is also intended to alert
the technician to determine if a cooling system
malfunction has occurred or if an additional trans-
mission air to oil cooler should be added to the
vehicle if the customer regularly drives in a man-
ner that overheats the transmission. Extended
operation above 115°C (240°F) will reduce the
durability of the transmission and should be
avoided. Correcting the cooling system malfunction
or installing an additional transmission oil cooler
will improve transmission durability especially for
customers who operate in city/construction stop
and go traffic, tow trailers regularly, drive aggres-
sively in low gear or drive regularly in mountain-
ous areas.
Transmission effects: Information only code. -
Overheat shift schedule was activated, no Limp-in
condition occurs. 2nd gear partial EMCC above 40
Km/h (25 MPH), 3rd gear EMCC from 45-69 Km/h
(28-43 MPH), delayed 3-4 upshift at 69 Km/h (43
MPH), early 4-3 coastdown at 66 Km/h (41 MPH),
EMCC operation under all conditions above 40
Km/h (25 MPH) except at closed throttle or 1st
gear.
Possible causes:
– Transmission Overfilled with Oil
– Engine cooling fan failure
– Engine thermostat stuck closed
– Radiator corroded or packed with dirt
– Transmission Oil Cooler Plugged
– Customer driving pattern requires additional
transmission cooling
Name of code: P0884(76) - Power-Up at Speed
When monitored: When PCM (transmission con-
trol module) initially powers-up.
Set condition: If the PCM powers up while in the
‘‘Drive’’ position and the vehicle is going above 32
Km/h (20 MPH), the code is set.
Theory of operation: If a vehicle loses power to
the PCM, the vehicle will go to the 2nd gear mode
since there is no power available to control the
transmission solenoids. However if power is re-
stored, the PCM will power-up and normal opera-
tion will be restored. This DTC identifies that
power to the PCM was restored when the gear
selector was in a ‘‘Drive’’ position while the vehicle
was moving at speeds above 32 Km/h (20 MPH). If
someone shifts to Neutral and cycles the ignition
key and quickly shifts to ‘‘Drive’’ while moving
before the PCM comes out of its START ROUTINE,
the DTC can be set. Therefore it is critical that this
DTC diagnosis repair procedure should only be
used if the vehicle is experiencing intermittent 2nd
gear operation and subsequently a return to nor-
mal operation during normal driving.
Transmission effects: No Limp-in condition. The
DTC is for information only when trying to diag-
nosis intermittent 2nd gear operation and subse-
quently a return to normal operation.
Possible causes:
– No Problem if vehicle is started in ‘‘neutral’’at
speeds above 32 Km/H (20 MPH) and shifted
quickly to ‘‘Drive’’ before PCM comes out of
the START ROUTINE.
FOR INTERMITTENT 2ND GEAR OPERA-
TION AND THEN A SUBSEQUENT RETURN
TO NORMAL OPERATION WITHOUT CY-
CLING THE IGNITION KEY
– Intermittent Direct Battery connection be-
tween PCM and battery.
– Intermittent Fused Ignition Switch Output
between PCM and ignition switch.
– Intermittent Ground to PCM.
Name of code: P1687(77) - No Communication
with the MIC
When monitored: Continuously with key on.
Set condition: If no PCI bus messages are re-
ceived from the Mechanical Instrument Cluster
(MIC) for 25 seconds.
Theory of operation: The PCM communicates
with the MIC using the PCI bus. It relies on certain
information to function properly. The PCM contin-
uously monitors the PCI bus to check for messages
broadcast from the PCM.
Transmission effects: Possible improper PCM
AutoStick configuration.
Possible causes:
> Open or shorted PCI bus circuit from MIC
> MIC
> PCM
Name of code: P1652(78) - Serial Communication
Link Malfunction
When monitored: Continuously with key on.
16
GENERAL INFORMATION
To Next Page
Loading...
