Thread: 1999 mercury tps

Originally Posted by fishokla

Anyone know how to check the tps on a mercury 225 efi

Kelly Davis if you need a properly trained Marine mechanic. 918-855-5250

https://m.youtube.com/watch?v=kS6E2p8Uzug

THROTTLE POSITION SENSOR (TPS) ADJUSTMENT
NOTE: The Digital Diagnostic Terminal (DDT) can be used to determine whether the TPS
is set within the recommended operating range of 0.200 – 0.300 volts. However, it is recommended
that the DDT not be used to make adjustments of the TPS. Due to the circuitry
characteristics of the ECM, the DDT is not able to always display accurately small TPS
movements. A digital voltmeter should be used when making adjustments to the TPS.
IMPORTANT: TAN/BLACK head temperature leads must be disconnected from port
cylinder head before adjusting TPS.
1. Disconnect TPS from EFI harness.
58055
a
b
a - TPS Connector
b - Throttle Position Sensor
2. Connect digital volt meter using TPS Test Lead Assembly (a) (P/N 91-859199) between
TPS connector (b) and EFI harness connector (c). Set voltmeter to 2 DC volts.
58054
a
b
c
a - TPS Test Lead Assembly
b - TPS Connector
c - EFI Harness Connector
MAINTENANCE
Page 2C-16 90-878079 JANUARY 2000
3. Disconnect TAN/BLACK engine head temperature sensor leads located on port cylinder
head.
58052
a
a - Temperature Sensor Leads
4. Turn key to the “ON” position.
5. Loosen screws (a) securing TPS to manifold.
58053
a
a - Screws
6. Rotate TPS fully clockwise (holding throttle shaft in closed position). On models with
ECM P/N 14623A15 and above, voltmeter should read .200 - .300. If readout is not
within specifications, adjust TPS to obtain readout of .240 - .260.
NOTE: If engine appears to run too rich or too lean, TPS can be readjusted. Decreasing
voltage yields leaner mixture. Increasing voltage yields richer mixture. Allowable TPS
range: .200 - .300 volts.
7. Tighten TPS screws holding correct tolerance.
8. Disconnect remote control cable from throttle lever.
9. Slowly move throttle lever to full open position while monitoring voltage reading. Voltage
reading should increase and decrease smoothly.
10. Set volt meter to 20 DC volts. Maximum voltage reading at full throttle is approximately
7.46 volts.
11. Remove test lead and reconnect TPS harness to EFI harness.


Thought someone else might find thius helpful!!!