Tribute LX 2WD V6-3.0L DOHC (2001)
2.
Inspection of Idle Air Control (IAC) Valve
a.
With the transmission in Park, the engine should idle at approximately 750 RPM, and the engine temperature should be at least 88°C (190°
F). All accessories and the engine cooling fan should be off.
b.
Using WDS version B20.12 or later, verify that Idle Air Control (IAC) duty cycle is within specification (between 32-40% with no purge
flow).
C.
If the Idle Air Control (IAC) duty cycle is within specification, proceed to Step 3. If IAC duty cycle is out of specification, replace IAC with
part number AJ03-20-660A.
d.
If IAC duty cycle is within specification after replacing with a new IAC, then proceed to Step 3. If IAC duty cycle is still out of
specification, replace throttle body with part number AJ03-13-640A.
e.
Verify corrective action, then proceed to Step 3.
NOTE:
Engine RPM will slowly ramp up. It is extremely important to check the IAC duty Cycle when the RPM is at 750 RPM. Even 800 RPM is too high
for checking IAC duty cycle under these conditions.
3.
PCM Reflashing
a.
Perform the following: If the vehicle was built on or after 9/13/2002, then proceed to Step 4 now. If not, reprogram the PCM with WDS
version B20.12 or later. Only use WDS version B20.12 or later during this reprogramming.
b.
Some 2001 model year PCMs cannot be reprogrammed and must be replaced. Replacement is determined by the MPC # located in the
upper left comer of the bar code on the PCM. If the PCM is an MPC 160, then replace with part number AJ08-18-881F and reprogram with
WDS version B20.12 or later. If the PCM is MPC 161, then just reprogram with WDS version B20.12 or later.
C.
Verify the latest calibration was successfully reprogrammed. WDS should show latest calibration level 1U7A-12A650-AYD if PCM tear tag
# SJC0, SJC1 or SJC2. For PCM tear tag HQP1, HQP2, HQP3 or RKG0, the latest calibration level is 2U7A-12A650-CRB. For tear tag
BAR0 or BAR1, the latest calibration level is 3L8A-12A650-BC.
NOTE:
For additional details on PCM reflashing, refer to the PCM REFLASH PROCEDURE SUPPLEMENT. Then proceed to Step 4.
4.
Inspection of Evaporative Vapor (EVAP) Management Valve
a.
With the transmission in Park, the engine should idle at approximately 750 RPM, and the engine temperature should be at least 88°C (190°
F). All accessories and the engine cooling fan should be off.
b.
With WDS version B20.12 (U.S.) or later, determine if the Evaporative Vapor Management (EVAPVM) duty cycle stops increasing and
remains at 95-100% while Fuel Tank Pressure (FTP) holds at approximately 2.6 volts. Monitor these parameters using PIDs - EVAPVM #
(in percent) and FTP (in volts). If this occurs, replace the EVAPVM valve with part number AJ03-18-741A.
c.
If EVAPVM is functioning correctly, the duty cycle should increase to 84-100% with the FTP decreasing to approximately 2.2 volts and
then recycle back to 0% duty cycle while FTP hold at approximately 2.6 volts. Do not replace the EVAPVM valve.
d.
Verify corrective action, then proceed to Step 5.
5.
Inspection of EVAP System Vent Line
a.
With the transmission in Park, the engine should idle at approximately 750 RPM, and the engine temperature should be at least 88°C (190°
F). All accessories and the engine cooling fan should be off.
b.
With WDS version B20.12 (U.S.) or later, if EVAPVM drops to 0% from 60-80% (premature purge shutoff), check for an obstructed vent
line. This condition may be accompanied by a sudden RPM drop while idling. The premature purge shutoff is caused by the tank not
reaching a pre-specified vacuum state.
c.
To clear the possible obstructed vent line, disconnect the vent line in the evaporative emissions system from the check valve side (check
valve part number is AJ03-42-910). This connection is located just forward of the evaporative emissions canister assembly, underneath the
vehicle in the area of the driver side rear seat.
d.
Using shop air, blow the vent line from the check valve side forward (towards the brake booster). In the past, spiders have been known to
construct webs in vent lines, so handle with caution. Possible obstructions in the vent line can prevent the evaporative emissions system
