GL1200 Ltd. and SEI Repair -- The PBL & PBR Sensors

The PB Sensor connectors are located at the top front of the frame near the
Steering Stem.

The PBR Sensor connector is GREEN, and the PBR Sensor connector is WHITE.

If your LED's are indicating a PBR Sensor problem, REVERSE the connectors,
and the vacuum hoses on the Sensors. If the LED indicators then shift to
the PBL Sensor as the problem, REPLACE the PBR Sensor. (This should also
work the other way. IE: The LED's indicate a PBL problem)

YOU ARE CHECKING CONTINUITY IN THE WIRING HARNESS BACK TO THE ECU IN THESE
TEST, NOT THE PB SENSORS THEMSELVES.

I USED A SIMPSON 260 FOR MOST OF THE TESTS THAT I TOOK ON THE MOTORCYCLE,
SINCE QUITE A FEW OF THESE TESTS REQUIRE THAT THE CONNECTORS BE BACK
TOGETHER IN ORDER TO GET THE PROPER READINGS, I SHARPENED THE TIP(S) ON THE
LEADS AND GENTLY INSERTED THE PROBE THROUGH THE WIRE INSULATION TO GET MY
READINGS. BEING CAREFUL NOT TO DAMAGE THE INSULATION, OR THE WIRE ITSELF.

Check for continuity between the GREEN wire and the #3 ECU Connector
Terminal for EACH PB Sensor.

Check for continuity between the PINK wire and the #29 ECU Connector
Terminal for EACH PB Sensor.

Check for continuity from the WHITE wire of the PBR Sensor and ECU Terminal
#27

Check for continuity from the BLUE wire of the PBL Sensor and ECU Terminal
#9

CHECK THE ECU IN THE NEXT FEW ITEMS.

Check for continuity from #9 and #27 ECU Terminals (Not the Connector) to
GROUND, and from these terminals and any other ECU Terminals. (Again the
ECU, not the ECU Cable Connector)

Check the Sensor Connectors for loose or poorly contacted terminals.

With the Switch ON, and the ECU Connector back in place, Check between the
PINK and GREEN wire for VOLTAGE. You should have a reading between 4.75 -
5.25 VOLTS. Check each PB Sensor.

DISCONNECT the vacuum tube from each PB Sensor. With the Ignition Switch
ON, Measure between the WHITE and GREEN wire on the PBR Sensor, and the
BLUE and GREEN wire on the PBL Sensor.

     The readings should be between 3.58 - 4.02 VOLTS.

YOU WILL NEED A VACUUM PUMP FOR THE NEXT SET OF TESTS. IF YOU DON'T HAVE
ONE, OR CAN NOT BORROW ONE THEN SKIP THIS SECTION AND DO THE ALTERNATE
TESTING PROCEDURE.

IF YOUR ENGINE WILL START, Connect the vacuum pump to the vacuum lines for
each Sensor by removing the plug in the end of each line. Start the engine
and see if the needle on the vacuum gauge respond to throttle variations.
If it does NOT, then check the vacuum lines back to the intake pipes for a
collapsed hose, blocked hose, or a hole in the vacuum lines first. Replace
any vacuum lines as necessary.

Turn OFF the engine, and hook up the vacuum pump to the vacuum hose at the
INTAKE manifold. APPLY VACUUM and see in the vacuum maintains the setting,
if it does NOT, check the vacuum hoses for detioration and replace as
necessary.

Connect a hand vacuum pump to the fitting on the PB Sensors. APPLY VACUUM.

Turn the Switch ON, and while maintaining the vacuum, measure between the
WHITE and GREEN, and the BLUE and GREEN wires on the PB Sensors.

The VOLTAGES should fall within these ranges for the given vacuum
indicated.

   * 1.93 in. 2.85 - 3.50 VOLTS
   * 5.83 in. 2.16 - 2.45 VOLTS
   * 9.67 in. 1.21 - 1.40 VOLTS

ALTERNATE PB SENSORS TESTING PROCEDURES.

With the engine running, measure between the WHITE and GREEN, and the BLUE
and GREEN wires from the PB Sensors. The VOLTAGE should follow smoothly as
the engine is run from IDLE to 3-4000 rpm. for each Sensor.

The Voltage should be in the range of 1.25 - 3.50 Volts.
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