B&M SHIFTPLUS
Moderator: F9K9
B&M SHIFTPLUS
hi.what do you think about the B&M shiftplus electronic shift improver?i saw it on synergy offroad.does it rely have no danger for trans?
-
HenryJ
- Admin K Elite
- Posts: 12705
- Joined: Tue Oct 01, 2002 9:14 pm
- Location: Ontario, Oregon
- Contact:
B&M ShiftPlus for 2002 CC? , BM ShiftPlus
There is also a mod page on our website- B&M Electronic Shift Improver
There is also a mod page on our website- B&M Electronic Shift Improver
"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
"Speed is just a matter of Money - How fast do YOU want to go?"-Mechanic from Mad Max-
If at first you don't succeed - Don't take up Skydiving! - ThunderII KE7CSK
The JET Shift Improver box and the B&M Electronic Shift kit do like HJ said. Just raise the line pressure so the shifts are firmer.
The B&M is either off or on ie: STOCK(off) or ENHANCED(on).
The Jet has 4 positions Stock, Stage 1, Stage 2, and Stage 3 (or Race).
I have the JET Unit (which has come off due to W4M PCM and Servo's). Stock and Stage 1 I really didn't see any noticible difference in part throttle shifts. Stage 2 was noticible (say stock is 5lbs of torque on a bolt then stage 2 was 7-8lbs) mostly on WOT UPSHIFTS. Stage 3 is very firm and occasionally throws a code (P0748) which is for the Shift pressure solenoid circuit.
I'm thinking that when in Stage 3 (jet) or ON (B&M) the circuit pressure is too high and not adjustable from the computers way of thinking. So it will throw the code. Just back off to Stage 2(jet) or Stock(B&M) erase the codes and start all over again. There may be resistors in the boxes that can be replaced with a slightly lower value until it doesn't throw a code.
This is off alldata for 2002 S-10 for P0748.
Circuit Description
The pressure control (PC) solenoid valve is an electronic device that regulates transmission line pressure based on the current flow through its coil winding. The magnetic field produced by the coil moves the solenoid's internal valve, which varies pressure to the pressure regulator valve. The powertrain control module (PCM) controls the PC solenoid valve by applying a varying amount of amperage to the solenoid. The applied amperage can vary from 0.1 to 1.1 amps. Low amperage, 0.1 amp, indicates high line pressure. High amperage, 1.1 amps, indicates low line pressure. The duty cycle of the PC solenoid valve is expressed as a percentage of energized ON time. Zero percent indicates zero ON time, non-energized, or no current flow. Approximately 60 percent at idle indicates maximum ON time, energized, or high current flow. The PCM determines the appropriate line pressure for a given load by comparing the throttle position sensor voltage, the engine speed and other inputs.
When the PCM detects a continuous open or short in the PC solenoid valve circuit, then DTC P0748 sets. DTC P0748 is a type C DTC.
Conditions for Running the DTC
The system voltage is 10 - 18 volts.
The engine is running.
Conditions for Setting the DTC
The PC solenoid valve duty cycle reaches its high limit, approximately 95 percent, or low limit, approximately 0 percent.
Action Taken When the DTC Sets
The PCM does not illuminate the malfunction indicator lamp (MIL).
The PC solenoid valve is OFF.
The PCM freezes shift adapts from being updated.
The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
The PCM stores DTC P0748 in PCM history.
Conditions for Clearing the DTC
A scan tool can clear the DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
Diagnostic Aids
DTC P0748 may set under low voltage conditions caused by high electrical system demands.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step tests the ability of the PCM to command the PC solenoid valve.
This step tests the PC solenoid valve and automatic transmission (AT) wiring harness assembly for incorrect resistance.
Larry
The B&M is either off or on ie: STOCK(off) or ENHANCED(on).
The Jet has 4 positions Stock, Stage 1, Stage 2, and Stage 3 (or Race).
I have the JET Unit (which has come off due to W4M PCM and Servo's). Stock and Stage 1 I really didn't see any noticible difference in part throttle shifts. Stage 2 was noticible (say stock is 5lbs of torque on a bolt then stage 2 was 7-8lbs) mostly on WOT UPSHIFTS. Stage 3 is very firm and occasionally throws a code (P0748) which is for the Shift pressure solenoid circuit.
I'm thinking that when in Stage 3 (jet) or ON (B&M) the circuit pressure is too high and not adjustable from the computers way of thinking. So it will throw the code. Just back off to Stage 2(jet) or Stock(B&M) erase the codes and start all over again. There may be resistors in the boxes that can be replaced with a slightly lower value until it doesn't throw a code.
This is off alldata for 2002 S-10 for P0748.
Circuit Description
The pressure control (PC) solenoid valve is an electronic device that regulates transmission line pressure based on the current flow through its coil winding. The magnetic field produced by the coil moves the solenoid's internal valve, which varies pressure to the pressure regulator valve. The powertrain control module (PCM) controls the PC solenoid valve by applying a varying amount of amperage to the solenoid. The applied amperage can vary from 0.1 to 1.1 amps. Low amperage, 0.1 amp, indicates high line pressure. High amperage, 1.1 amps, indicates low line pressure. The duty cycle of the PC solenoid valve is expressed as a percentage of energized ON time. Zero percent indicates zero ON time, non-energized, or no current flow. Approximately 60 percent at idle indicates maximum ON time, energized, or high current flow. The PCM determines the appropriate line pressure for a given load by comparing the throttle position sensor voltage, the engine speed and other inputs.
When the PCM detects a continuous open or short in the PC solenoid valve circuit, then DTC P0748 sets. DTC P0748 is a type C DTC.
Conditions for Running the DTC
The system voltage is 10 - 18 volts.
The engine is running.
Conditions for Setting the DTC
The PC solenoid valve duty cycle reaches its high limit, approximately 95 percent, or low limit, approximately 0 percent.
Action Taken When the DTC Sets
The PCM does not illuminate the malfunction indicator lamp (MIL).
The PC solenoid valve is OFF.
The PCM freezes shift adapts from being updated.
The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
The PCM stores DTC P0748 in PCM history.
Conditions for Clearing the DTC
A scan tool can clear the DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
Diagnostic Aids
DTC P0748 may set under low voltage conditions caused by high electrical system demands.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step tests the ability of the PCM to command the PC solenoid valve.
This step tests the PC solenoid valve and automatic transmission (AT) wiring harness assembly for incorrect resistance.
Larry
2002 S-10 ZR-5 Quad-CAB
1995 GMC Jimmy 4Dr. SLT
1995 GMC Jimmy 4Dr. SLT